IPostBackDataHandler not working properly with DataGrid

[buzlite@sympatico.ca]

Hello All,


I've posted this in
microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
reply so I'll try my luck here.

Any help would be greatly appreciated.
Thanks



I am having some difficulties with a user control implementing
IPostBackDataHandler when it is placed inside a datagrid.

I have created a user control (MyUserControl.ascx) containing 1 TextBox
that implements the IPostBackDataHandler.
I have also created a form (WebForm1.aspx) that contains 1 datagrid of
which the datagrid contains the above user control as specified in its
template.

The purpose is to dynamically create one MyUserControl for each item in
the datasource for display and editing.

When the program is run and text is entered into MyUserControl's
textbox, the LoadPostData() of MyUserControl.ascx is called as
expected. But even though LoadPostData() returns true the
corresponding RaisePostDataChangedEvent() is not called.


Note: if I were to simply include the MyUserControl.ascx in
WebForm1.aspx, then both LoadPostData() and RaisePostDataChangedEvent()
of MyUserControl.ascx are called as expected.

Would someone give me some insight as to why this is not working ? Am
I missing a step somewhere ?



Attached is the bare essential code snippets to reproduce the problem.


MyUserControl.ascx
-----------------------------------------------------
<%@ Control Language="c#" AutoEventWireup="false"
Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox>


MyUserControl.ascx.cs
-----------------------------------------------------
public class MyUserControl : System.Web.UI.UserControl,
IPostBackDataHandler, INamingContainer
{
protected System.Web.UI.WebControls.TextBox TextBox1;


#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);

if (Page != null)
{
Page.RegisterRequiresPostBack(this);
}
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion


public virtual bool LoadPostData(string postDataKey,
System.Collections.Specialized.NameValueCollection postCollection)
{
return true;
}

public virtual void RaisePostDataChangedEvent()
{
}

private void Page_Load(object sender, System.EventArgs e)
{
}
}



WebForm1.aspx
------------------------------------------------------
<%@ Register TagPrefix="f4c" TagName="MyUserControl"
Src="MyUserControl.ascx" %>
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
AutoEventWireup="false" Inherits="test.WebForm1" %>
....
<form id="Form1" method="post" runat="server">
<asp:datagrid id="dgListing" runat="server"
AutoGenerateColumns="False">
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<f4c:MyUserControl id="MyUserControl1"
runat="server"></f4c:MyUserControl>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
</form>


WebForm1.aspx.cs
------------------------------------------------------
public class WebForm1 : System.Web.UI.Page
{

....
private void Page_Load(object sender, System.EventArgs e)
{
//setup handlers
this.Button1.Click += new System.EventHandler(this.Button1_Click);

//setup datagrid
dgListing.DataSource = this.CreateDataSource();
dgListing.DataBind();
}

private void Button1_Click(object sender, System.EventArgs e)
{
}

ICollection CreateDataSource()
{
DataTable dt = new DataTable();
DataRow dr;

dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));

for (int i = 0; i < 2; i++)
{
dr = dt.NewRow();
dr[0] = i;
dt.Rows.Add(dr);
}

DataView dv = new DataView(dt);
return dv;
}
}

[Gaurav Vaish \(www.EduJini.IN\)]

> The purpose is to dynamically create one MyUserControl for each item in

> the datasource for display and editing.

How and where are you adding it?

The best place is CreateChildControls() method.


--
Happy Hacking,
Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
[url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
-------------------

[buzlite@sympatico.ca]

The user control is added inside the WebForm1.aspx file inside the
column template of the datagrid control

Thanks


Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

> > The purpose is to dynamically create one MyUserControl for each item in
> > the datasource for display and editing.

>
> How and where are you adding it?
>
> The best place is CreateChildControls() method.
>
>
> --
> Happy Hacking,
> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> -------------------

[buzlite@sympatico.ca]

Hello All,
Any help would be appreciated.
Thanks



[email]buzlite@sympatico.ca[/email] wrote:

> Hello All,
>
>
> I've posted this in
> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
> reply so I'll try my luck here.
>
> Any help would be greatly appreciated.
> Thanks
>
>
>
> I am having some difficulties with a user control implementing
> IPostBackDataHandler when it is placed inside a datagrid.
>
> I have created a user control (MyUserControl.ascx) containing 1 TextBox
> that implements the IPostBackDataHandler.
> I have also created a form (WebForm1.aspx) that contains 1 datagrid of
> which the datagrid contains the above user control as specified in its
> template.
>
> The purpose is to dynamically create one MyUserControl for each item in
> the datasource for display and editing.
>
> When the program is run and text is entered into MyUserControl's
> textbox, the LoadPostData() of MyUserControl.ascx is called as
> expected. But even though LoadPostData() returns true the
> corresponding RaisePostDataChangedEvent() is not called.
>
>
> Note: if I were to simply include the MyUserControl.ascx in
> WebForm1.aspx, then both LoadPostData() and RaisePostDataChangedEvent()
> of MyUserControl.ascx are called as expected.
>
> Would someone give me some insight as to why this is not working ? Am
> I missing a step somewhere ?
>
>
>
> Attached is the bare essential code snippets to reproduce the problem.
>
>
> MyUserControl.ascx
> -----------------------------------------------------
> <%@ Control Language="c#" AutoEventWireup="false"
> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
>
>
> MyUserControl.ascx.cs
> -----------------------------------------------------
> public class MyUserControl : System.Web.UI.UserControl,
> IPostBackDataHandler, INamingContainer
> {
> protected System.Web.UI.WebControls.TextBox TextBox1;
>
>
> #region Web Form Designer generated code
> override protected void OnInit(EventArgs e)
> {
> //
> // CODEGEN: This call is required by the ASP.NET Web Form Designer.
> //
> InitializeComponent();
> base.OnInit(e);
>
> if (Page != null)
> {
> Page.RegisterRequiresPostBack(this);
> }
> }
>
> /// <summary>
> /// Required method for Designer support - do not modify
> /// the contents of this method with the code editor.
> /// </summary>
> private void InitializeComponent()
> {
> this.Load += new System.EventHandler(this.Page_Load);
>
> }
> #endregion
>
>
> public virtual bool LoadPostData(string postDataKey,
> System.Collections.Specialized.NameValueCollection postCollection)
> {
> return true;
> }
>
> public virtual void RaisePostDataChangedEvent()
> {
> }
>
> private void Page_Load(object sender, System.EventArgs e)
> {
> }
> }
>
>
>
> WebForm1.aspx
> ------------------------------------------------------
> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
> Src="MyUserControl.ascx" %>
> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
> AutoEventWireup="false" Inherits="test.WebForm1" %>
> ...
> <form id="Form1" method="post" runat="server">
> <asp:datagrid id="dgListing" runat="server"
> AutoGenerateColumns="False">
> <Columns>
> <asp:TemplateColumn>
> <ItemTemplate>
> <f4c:MyUserControl id="MyUserControl1"
> runat="server"></f4c:MyUserControl>
> </ItemTemplate>
> </asp:TemplateColumn>
> </Columns>
> </asp:datagrid>
> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
> </form>
>
>
> WebForm1.aspx.cs
> ------------------------------------------------------
> public class WebForm1 : System.Web.UI.Page
> {
>
> ...
> private void Page_Load(object sender, System.EventArgs e)
> {
> //setup handlers
> this.Button1.Click += new System.EventHandler(this.Button1_Click);
>
> //setup datagrid
> dgListing.DataSource = this.CreateDataSource();
> dgListing.DataBind();
> }
>
> private void Button1_Click(object sender, System.EventArgs e)
> {
> }
>
> ICollection CreateDataSource()
> {
> DataTable dt = new DataTable();
> DataRow dr;
>
> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
>
> for (int i = 0; i < 2; i++)
> {
> dr = dt.NewRow();
> dr[0] = i;
> dt.Rows.Add(dr);
> }
>
> DataView dv = new DataView(dt);
> return dv;
> }
> }

[Gaurav Vaish \(www.EduJini.IN\)]

Hi,

The only missing thing that will need to fill, as I think, is a simple
hidden field... so that it can be captured in LoadPostData.

btw, what happens if you blindly return 'true' in LoadPostData?


--
Happy Hacking,
Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
[url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
-------------------


<buzlite@sympatico.ca> wrote in message
news:1155567351.199524.188830@m79g2000cwm.googlegr oups.com...

> Hello All,
> Any help would be appreciated.
> Thanks
>
>
>
> [email]buzlite@sympatico.ca[/email] wrote:

>> Hello All,
>>
>>
>> I've posted this in
>> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
>> reply so I'll try my luck here.
>>
>> Any help would be greatly appreciated.
>> Thanks
>>
>>
>>
>> I am having some difficulties with a user control implementing
>> IPostBackDataHandler when it is placed inside a datagrid.
>>
>> I have created a user control (MyUserControl.ascx) containing 1 TextBox
>> that implements the IPostBackDataHandler.
>> I have also created a form (WebForm1.aspx) that contains 1 datagrid of
>> which the datagrid contains the above user control as specified in its
>> template.
>>
>> The purpose is to dynamically create one MyUserControl for each item in
>> the datasource for display and editing.
>>
>> When the program is run and text is entered into MyUserControl's
>> textbox, the LoadPostData() of MyUserControl.ascx is called as
>> expected. But even though LoadPostData() returns true the
>> corresponding RaisePostDataChangedEvent() is not called.
>>
>>
>> Note: if I were to simply include the MyUserControl.ascx in
>> WebForm1.aspx, then both LoadPostData() and RaisePostDataChangedEvent()
>> of MyUserControl.ascx are called as expected.
>>
>> Would someone give me some insight as to why this is not working ? Am
>> I missing a step somewhere ?
>>
>>
>>
>> Attached is the bare essential code snippets to reproduce the problem.
>>
>>
>> MyUserControl.ascx
>> -----------------------------------------------------
>> <%@ Control Language="c#" AutoEventWireup="false"
>> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
>> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
>> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
>>
>>
>> MyUserControl.ascx.cs
>> -----------------------------------------------------
>> public class MyUserControl : System.Web.UI.UserControl,
>> IPostBackDataHandler, INamingContainer
>> {
>> protected System.Web.UI.WebControls.TextBox TextBox1;
>>
>>
>> #region Web Form Designer generated code
>> override protected void OnInit(EventArgs e)
>> {
>> //
>> // CODEGEN: This call is required by the ASP.NET Web Form Designer.
>> //
>> InitializeComponent();
>> base.OnInit(e);
>>
>> if (Page != null)
>> {
>> Page.RegisterRequiresPostBack(this);
>> }
>> }
>>
>> /// <summary>
>> /// Required method for Designer support - do not modify
>> /// the contents of this method with the code editor.
>> /// </summary>
>> private void InitializeComponent()
>> {
>> this.Load += new System.EventHandler(this.Page_Load);
>>
>> }
>> #endregion
>>
>>
>> public virtual bool LoadPostData(string postDataKey,
>> System.Collections.Specialized.NameValueCollection postCollection)
>> {
>> return true;
>> }
>>
>> public virtual void RaisePostDataChangedEvent()
>> {
>> }
>>
>> private void Page_Load(object sender, System.EventArgs e)
>> {
>> }
>> }
>>
>>
>>
>> WebForm1.aspx
>> ------------------------------------------------------
>> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
>> Src="MyUserControl.ascx" %>
>> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
>> AutoEventWireup="false" Inherits="test.WebForm1" %>
>> ...
>> <form id="Form1" method="post" runat="server">
>> <asp:datagrid id="dgListing" runat="server"
>> AutoGenerateColumns="False">
>> <Columns>
>> <asp:TemplateColumn>
>> <ItemTemplate>
>> <f4c:MyUserControl id="MyUserControl1"
>> runat="server"></f4c:MyUserControl>
>> </ItemTemplate>
>> </asp:TemplateColumn>
>> </Columns>
>> </asp:datagrid>
>> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
>> </form>
>>
>>
>> WebForm1.aspx.cs
>> ------------------------------------------------------
>> public class WebForm1 : System.Web.UI.Page
>> {
>>
>> ...
>> private void Page_Load(object sender, System.EventArgs e)
>> {
>> //setup handlers
>> this.Button1.Click += new System.EventHandler(this.Button1_Click);
>>
>> //setup datagrid
>> dgListing.DataSource = this.CreateDataSource();
>> dgListing.DataBind();
>> }
>>
>> private void Button1_Click(object sender, System.EventArgs e)
>> {
>> }
>>
>> ICollection CreateDataSource()
>> {
>> DataTable dt = new DataTable();
>> DataRow dr;
>>
>> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
>>
>> for (int i = 0; i < 2; i++)
>> {
>> dr = dt.NewRow();
>> dr[0] = i;
>> dt.Rows.Add(dr);
>> }
>>
>> DataView dv = new DataView(dt);
>> return dv;
>> }
>> }

>

[buzlite@sympatico.ca]

Hello Gaurav,

I do not know the reasoning for adding a hidden field and what purpose
that would accomplish.

>From the sample code attachments, when WebForm1.aspx is run and the

Datagrid generates MyUserControl user control, any text that is entered
in this user control TextBox would be properly posted back to the
server. This is true in that when MyUserControl.ascx.cs,
LoadPostData() is called, the data can be retrieved from the input
parameter of this method. So...this is working OK.

The problem is, when MyUserControl.ascx.cs, LoadPostData() returns a
value of 'true', RaisePostDataChangedEvent() is never invoked. In the
MyUserControl.ascx.cs code snippet, I hardcoded a return of 'true'.
Even then, RaisePostDataChangedEvent() is never invoked. This is the
main problem that I am experiencing.

Any insights ?

Thanks



Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

> Hi,
>
> The only missing thing that will need to fill, as I think, is a simple
> hidden field... so that it can be captured in LoadPostData.
>
> btw, what happens if you blindly return 'true' in LoadPostData?
>
>
> --
> Happy Hacking,
> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> -------------------
>
>
> <buzlite@sympatico.ca> wrote in message
> news:1155567351.199524.188830@m79g2000cwm.googlegr oups.com...

> > Hello All,
> > Any help would be appreciated.
> > Thanks
> >
> >
> >
> > [email]buzlite@sympatico.ca[/email] wrote:

> >> Hello All,
> >>
> >>
> >> I've posted this in
> >> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
> >> reply so I'll try my luck here.
> >>
> >> Any help would be greatly appreciated.
> >> Thanks
> >>
> >>
> >>
> >> I am having some difficulties with a user control implementing
> >> IPostBackDataHandler when it is placed inside a datagrid.
> >>
> >> I have created a user control (MyUserControl.ascx) containing 1 TextBox
> >> that implements the IPostBackDataHandler.
> >> I have also created a form (WebForm1.aspx) that contains 1 datagrid of
> >> which the datagrid contains the above user control as specified in its
> >> template.
> >>
> >> The purpose is to dynamically create one MyUserControl for each item in
> >> the datasource for display and editing.
> >>
> >> When the program is run and text is entered into MyUserControl's
> >> textbox, the LoadPostData() of MyUserControl.ascx is called as
> >> expected. But even though LoadPostData() returns true the
> >> corresponding RaisePostDataChangedEvent() is not called.
> >>
> >>
> >> Note: if I were to simply include the MyUserControl.ascx in
> >> WebForm1.aspx, then both LoadPostData() and RaisePostDataChangedEvent()
> >> of MyUserControl.ascx are called as expected.
> >>
> >> Would someone give me some insight as to why this is not working ? Am
> >> I missing a step somewhere ?
> >>
> >>
> >>
> >> Attached is the bare essential code snippets to reproduce the problem.
> >>
> >>
> >> MyUserControl.ascx
> >> -----------------------------------------------------
> >> <%@ Control Language="c#" AutoEventWireup="false"
> >> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
> >> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
> >> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
> >>
> >>
> >> MyUserControl.ascx.cs
> >> -----------------------------------------------------
> >> public class MyUserControl : System.Web.UI.UserControl,
> >> IPostBackDataHandler, INamingContainer
> >> {
> >> protected System.Web.UI.WebControls.TextBox TextBox1;
> >>
> >>
> >> #region Web Form Designer generated code
> >> override protected void OnInit(EventArgs e)
> >> {
> >> //
> >> // CODEGEN: This call is required by the ASP.NET Web Form Designer.
> >> //
> >> InitializeComponent();
> >> base.OnInit(e);
> >>
> >> if (Page != null)
> >> {
> >> Page.RegisterRequiresPostBack(this);
> >> }
> >> }
> >>
> >> /// <summary>
> >> /// Required method for Designer support - do not modify
> >> /// the contents of this method with the code editor.
> >> /// </summary>
> >> private void InitializeComponent()
> >> {
> >> this.Load += new System.EventHandler(this.Page_Load);
> >>
> >> }
> >> #endregion
> >>
> >>
> >> public virtual bool LoadPostData(string postDataKey,
> >> System.Collections.Specialized.NameValueCollection postCollection)
> >> {
> >> return true;
> >> }
> >>
> >> public virtual void RaisePostDataChangedEvent()
> >> {
> >> }
> >>
> >> private void Page_Load(object sender, System.EventArgs e)
> >> {
> >> }
> >> }
> >>
> >>
> >>
> >> WebForm1.aspx
> >> ------------------------------------------------------
> >> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
> >> Src="MyUserControl.ascx" %>
> >> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
> >> AutoEventWireup="false" Inherits="test.WebForm1" %>
> >> ...
> >> <form id="Form1" method="post" runat="server">
> >> <asp:datagrid id="dgListing" runat="server"
> >> AutoGenerateColumns="False">
> >> <Columns>
> >> <asp:TemplateColumn>
> >> <ItemTemplate>
> >> <f4c:MyUserControl id="MyUserControl1"
> >> runat="server"></f4c:MyUserControl>
> >> </ItemTemplate>
> >> </asp:TemplateColumn>
> >> </Columns>
> >> </asp:datagrid>
> >> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
> >> </form>
> >>
> >>
> >> WebForm1.aspx.cs
> >> ------------------------------------------------------
> >> public class WebForm1 : System.Web.UI.Page
> >> {
> >>
> >> ...
> >> private void Page_Load(object sender, System.EventArgs e)
> >> {
> >> //setup handlers
> >> this.Button1.Click += new System.EventHandler(this.Button1_Click);
> >>
> >> //setup datagrid
> >> dgListing.DataSource = this.CreateDataSource();
> >> dgListing.DataBind();
> >> }
> >>
> >> private void Button1_Click(object sender, System.EventArgs e)
> >> {
> >> }
> >>
> >> ICollection CreateDataSource()
> >> {
> >> DataTable dt = new DataTable();
> >> DataRow dr;
> >>
> >> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
> >>
> >> for (int i = 0; i < 2; i++)
> >> {
> >> dr = dt.NewRow();
> >> dr[0] = i;
> >> dt.Rows.Add(dr);
> >> }
> >>
> >> DataView dv = new DataView(dt);
> >> return dv;
> >> }
> >> }

> >

[Gaurav Vaish \(www.EduJini.IN\)]

Let me give it a shot by creating a dummy 'UserControl' on my own.

--
Happy Hacking,
Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
[url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
-------------------


<buzlite@sympatico.ca> wrote in message
news:1155591996.737095.53890@b28g2000cwb.googlegro ups.com...

> Hello Gaurav,
>
> I do not know the reasoning for adding a hidden field and what purpose
> that would accomplish.
>

>>From the sample code attachments, when WebForm1.aspx is run and the

> Datagrid generates MyUserControl user control, any text that is entered
> in this user control TextBox would be properly posted back to the
> server. This is true in that when MyUserControl.ascx.cs,
> LoadPostData() is called, the data can be retrieved from the input
> parameter of this method. So...this is working OK.
>
> The problem is, when MyUserControl.ascx.cs, LoadPostData() returns a
> value of 'true', RaisePostDataChangedEvent() is never invoked. In the
> MyUserControl.ascx.cs code snippet, I hardcoded a return of 'true'.
> Even then, RaisePostDataChangedEvent() is never invoked. This is the
> main problem that I am experiencing.
>
> Any insights ?
>
> Thanks
>
>
>
> Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

>> Hi,
>>
>> The only missing thing that will need to fill, as I think, is a simple
>> hidden field... so that it can be captured in LoadPostData.
>>
>> btw, what happens if you blindly return 'true' in LoadPostData?
>>
>>
>> --
>> Happy Hacking,
>> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
>> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
>> -------------------
>>
>>
>> <buzlite@sympatico.ca> wrote in message
>> news:1155567351.199524.188830@m79g2000cwm.googlegr oups.com...

>> > Hello All,
>> > Any help would be appreciated.
>> > Thanks
>> >
>> >
>> >
>> > [email]buzlite@sympatico.ca[/email] wrote:
>> >> Hello All,
>> >>
>> >>
>> >> I've posted this in
>> >> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
>> >> reply so I'll try my luck here.
>> >>
>> >> Any help would be greatly appreciated.
>> >> Thanks
>> >>
>> >>
>> >>
>> >> I am having some difficulties with a user control implementing
>> >> IPostBackDataHandler when it is placed inside a datagrid.
>> >>
>> >> I have created a user control (MyUserControl.ascx) containing 1
>> >> TextBox
>> >> that implements the IPostBackDataHandler.
>> >> I have also created a form (WebForm1.aspx) that contains 1 datagrid of
>> >> which the datagrid contains the above user control as specified in its
>> >> template.
>> >>
>> >> The purpose is to dynamically create one MyUserControl for each item
>> >> in
>> >> the datasource for display and editing.
>> >>
>> >> When the program is run and text is entered into MyUserControl's
>> >> textbox, the LoadPostData() of MyUserControl.ascx is called as
>> >> expected. But even though LoadPostData() returns true the
>> >> corresponding RaisePostDataChangedEvent() is not called.
>> >>
>> >>
>> >> Note: if I were to simply include the MyUserControl.ascx in
>> >> WebForm1.aspx, then both LoadPostData() and
>> >> RaisePostDataChangedEvent()
>> >> of MyUserControl.ascx are called as expected.
>> >>
>> >> Would someone give me some insight as to why this is not working ? Am
>> >> I missing a step somewhere ?
>> >>
>> >>
>> >>
>> >> Attached is the bare essential code snippets to reproduce the problem.
>> >>
>> >>
>> >> MyUserControl.ascx
>> >> -----------------------------------------------------
>> >> <%@ Control Language="c#" AutoEventWireup="false"
>> >> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
>> >> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
>> >> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
>> >>
>> >>
>> >> MyUserControl.ascx.cs
>> >> -----------------------------------------------------
>> >> public class MyUserControl : System.Web.UI.UserControl,
>> >> IPostBackDataHandler, INamingContainer
>> >> {
>> >> protected System.Web.UI.WebControls.TextBox TextBox1;
>> >>
>> >>
>> >> #region Web Form Designer generated code
>> >> override protected void OnInit(EventArgs e)
>> >> {
>> >> //
>> >> // CODEGEN: This call is required by the ASP.NET Web Form Designer.
>> >> //
>> >> InitializeComponent();
>> >> base.OnInit(e);
>> >>
>> >> if (Page != null)
>> >> {
>> >> Page.RegisterRequiresPostBack(this);
>> >> }
>> >> }
>> >>
>> >> /// <summary>
>> >> /// Required method for Designer support - do not modify
>> >> /// the contents of this method with the code editor.
>> >> /// </summary>
>> >> private void InitializeComponent()
>> >> {
>> >> this.Load += new System.EventHandler(this.Page_Load);
>> >>
>> >> }
>> >> #endregion
>> >>
>> >>
>> >> public virtual bool LoadPostData(string postDataKey,
>> >> System.Collections.Specialized.NameValueCollection postCollection)
>> >> {
>> >> return true;
>> >> }
>> >>
>> >> public virtual void RaisePostDataChangedEvent()
>> >> {
>> >> }
>> >>
>> >> private void Page_Load(object sender, System.EventArgs e)
>> >> {
>> >> }
>> >> }
>> >>
>> >>
>> >>
>> >> WebForm1.aspx
>> >> ------------------------------------------------------
>> >> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
>> >> Src="MyUserControl.ascx" %>
>> >> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
>> >> AutoEventWireup="false" Inherits="test.WebForm1" %>
>> >> ...
>> >> <form id="Form1" method="post" runat="server">
>> >> <asp:datagrid id="dgListing" runat="server"
>> >> AutoGenerateColumns="False">
>> >> <Columns>
>> >> <asp:TemplateColumn>
>> >> <ItemTemplate>
>> >> <f4c:MyUserControl id="MyUserControl1"
>> >> runat="server"></f4c:MyUserControl>
>> >> </ItemTemplate>
>> >> </asp:TemplateColumn>
>> >> </Columns>
>> >> </asp:datagrid>
>> >> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
>> >> </form>
>> >>
>> >>
>> >> WebForm1.aspx.cs
>> >> ------------------------------------------------------
>> >> public class WebForm1 : System.Web.UI.Page
>> >> {
>> >>
>> >> ...
>> >> private void Page_Load(object sender, System.EventArgs e)
>> >> {
>> >> //setup handlers
>> >> this.Button1.Click += new System.EventHandler(this.Button1_Click);
>> >>
>> >> //setup datagrid
>> >> dgListing.DataSource = this.CreateDataSource();
>> >> dgListing.DataBind();
>> >> }
>> >>
>> >> private void Button1_Click(object sender, System.EventArgs e)
>> >> {
>> >> }
>> >>
>> >> ICollection CreateDataSource()
>> >> {
>> >> DataTable dt = new DataTable();
>> >> DataRow dr;
>> >>
>> >> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
>> >>
>> >> for (int i = 0; i < 2; i++)
>> >> {
>> >> dr = dt.NewRow();
>> >> dr[0] = i;
>> >> dt.Rows.Add(dr);
>> >> }
>> >>
>> >> DataView dv = new DataView(dt);
>> >> return dv;
>> >> }
>> >> }
>> >

>

[Gaurav Vaish \(www.EduJini.IN\)]

Problem solved.
btw, the hidden field would be required because of the following reason:

For each ClientID that appears in the form and the control corresponding to
the same, the IPostBackDataHandler methods would be called.
And for no else.

Here's a trick:

Add a hidden field during 'Render' to the output.

You may download the code (that I wrote) from the following URL:
[url]http://www.edujini.in/samples/ASP.Net/2.0/DataHandlerControl.zip[/url]


--
Happy Hacking,
Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
[url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
-------------------


"Gaurav Vaish (www.EduJini.IN)" <gaurav.vaish.nospam@nospam.gmail.com> wrote
in message news:OOulE4BwGHA.1288@TK2MSFTNGP02.phx.gbl...

> Let me give it a shot by creating a dummy 'UserControl' on my own.
>
> --
> Happy Hacking,
> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> -------------------
>
>
> <buzlite@sympatico.ca> wrote in message
> news:1155591996.737095.53890@b28g2000cwb.googlegro ups.com...

>> Hello Gaurav,
>>
>> I do not know the reasoning for adding a hidden field and what purpose
>> that would accomplish.
>>

>>>From the sample code attachments, when WebForm1.aspx is run and the

>> Datagrid generates MyUserControl user control, any text that is entered
>> in this user control TextBox would be properly posted back to the
>> server. This is true in that when MyUserControl.ascx.cs,
>> LoadPostData() is called, the data can be retrieved from the input
>> parameter of this method. So...this is working OK.
>>
>> The problem is, when MyUserControl.ascx.cs, LoadPostData() returns a
>> value of 'true', RaisePostDataChangedEvent() is never invoked. In the
>> MyUserControl.ascx.cs code snippet, I hardcoded a return of 'true'.
>> Even then, RaisePostDataChangedEvent() is never invoked. This is the
>> main problem that I am experiencing.
>>
>> Any insights ?
>>
>> Thanks
>>
>>
>>
>> Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

>>> Hi,
>>>
>>> The only missing thing that will need to fill, as I think, is a simple
>>> hidden field... so that it can be captured in LoadPostData.
>>>
>>> btw, what happens if you blindly return 'true' in LoadPostData?
>>>
>>>
>>> --
>>> Happy Hacking,
>>> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
>>> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
>>> -------------------
>>>
>>>
>>> <buzlite@sympatico.ca> wrote in message
>>> news:1155567351.199524.188830@m79g2000cwm.googlegr oups.com...
>>> > Hello All,
>>> > Any help would be appreciated.
>>> > Thanks
>>> >
>>> >
>>> >
>>> > [email]buzlite@sympatico.ca[/email] wrote:
>>> >> Hello All,
>>> >>
>>> >>
>>> >> I've posted this in
>>> >> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
>>> >> reply so I'll try my luck here.
>>> >>
>>> >> Any help would be greatly appreciated.
>>> >> Thanks
>>> >>
>>> >>
>>> >>
>>> >> I am having some difficulties with a user control implementing
>>> >> IPostBackDataHandler when it is placed inside a datagrid.
>>> >>
>>> >> I have created a user control (MyUserControl.ascx) containing 1
>>> >> TextBox
>>> >> that implements the IPostBackDataHandler.
>>> >> I have also created a form (WebForm1.aspx) that contains 1 datagrid
>>> >> of
>>> >> which the datagrid contains the above user control as specified in
>>> >> its
>>> >> template.
>>> >>
>>> >> The purpose is to dynamically create one MyUserControl for each item
>>> >> in
>>> >> the datasource for display and editing.
>>> >>
>>> >> When the program is run and text is entered into MyUserControl's
>>> >> textbox, the LoadPostData() of MyUserControl.ascx is called as
>>> >> expected. But even though LoadPostData() returns true the
>>> >> corresponding RaisePostDataChangedEvent() is not called.
>>> >>
>>> >>
>>> >> Note: if I were to simply include the MyUserControl.ascx in
>>> >> WebForm1.aspx, then both LoadPostData() and
>>> >> RaisePostDataChangedEvent()
>>> >> of MyUserControl.ascx are called as expected.
>>> >>
>>> >> Would someone give me some insight as to why this is not working ?
>>> >> Am
>>> >> I missing a step somewhere ?
>>> >>
>>> >>
>>> >>
>>> >> Attached is the bare essential code snippets to reproduce the
>>> >> problem.
>>> >>
>>> >>
>>> >> MyUserControl.ascx
>>> >> -----------------------------------------------------
>>> >> <%@ Control Language="c#" AutoEventWireup="false"
>>> >> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
>>> >> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
>>> >> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
>>> >>
>>> >>
>>> >> MyUserControl.ascx.cs
>>> >> -----------------------------------------------------
>>> >> public class MyUserControl : System.Web.UI.UserControl,
>>> >> IPostBackDataHandler, INamingContainer
>>> >> {
>>> >> protected System.Web.UI.WebControls.TextBox TextBox1;
>>> >>
>>> >>
>>> >> #region Web Form Designer generated code
>>> >> override protected void OnInit(EventArgs e)
>>> >> {
>>> >> //
>>> >> // CODEGEN: This call is required by the ASP.NET Web Form Designer.
>>> >> //
>>> >> InitializeComponent();
>>> >> base.OnInit(e);
>>> >>
>>> >> if (Page != null)
>>> >> {
>>> >> Page.RegisterRequiresPostBack(this);
>>> >> }
>>> >> }
>>> >>
>>> >> /// <summary>
>>> >> /// Required method for Designer support - do not modify
>>> >> /// the contents of this method with the code editor.
>>> >> /// </summary>
>>> >> private void InitializeComponent()
>>> >> {
>>> >> this.Load += new System.EventHandler(this.Page_Load);
>>> >>
>>> >> }
>>> >> #endregion
>>> >>
>>> >>
>>> >> public virtual bool LoadPostData(string postDataKey,
>>> >> System.Collections.Specialized.NameValueCollection postCollection)
>>> >> {
>>> >> return true;
>>> >> }
>>> >>
>>> >> public virtual void RaisePostDataChangedEvent()
>>> >> {
>>> >> }
>>> >>
>>> >> private void Page_Load(object sender, System.EventArgs e)
>>> >> {
>>> >> }
>>> >> }
>>> >>
>>> >>
>>> >>
>>> >> WebForm1.aspx
>>> >> ------------------------------------------------------
>>> >> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
>>> >> Src="MyUserControl.ascx" %>
>>> >> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
>>> >> AutoEventWireup="false" Inherits="test.WebForm1" %>
>>> >> ...
>>> >> <form id="Form1" method="post" runat="server">
>>> >> <asp:datagrid id="dgListing" runat="server"
>>> >> AutoGenerateColumns="False">
>>> >> <Columns>
>>> >> <asp:TemplateColumn>
>>> >> <ItemTemplate>
>>> >> <f4c:MyUserControl id="MyUserControl1"
>>> >> runat="server"></f4c:MyUserControl>
>>> >> </ItemTemplate>
>>> >> </asp:TemplateColumn>
>>> >> </Columns>
>>> >> </asp:datagrid>
>>> >> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
>>> >> </form>
>>> >>
>>> >>
>>> >> WebForm1.aspx.cs
>>> >> ------------------------------------------------------
>>> >> public class WebForm1 : System.Web.UI.Page
>>> >> {
>>> >>
>>> >> ...
>>> >> private void Page_Load(object sender, System.EventArgs e)
>>> >> {
>>> >> //setup handlers
>>> >> this.Button1.Click += new System.EventHandler(this.Button1_Click);
>>> >>
>>> >> //setup datagrid
>>> >> dgListing.DataSource = this.CreateDataSource();
>>> >> dgListing.DataBind();
>>> >> }
>>> >>
>>> >> private void Button1_Click(object sender, System.EventArgs e)
>>> >> {
>>> >> }
>>> >>
>>> >> ICollection CreateDataSource()
>>> >> {
>>> >> DataTable dt = new DataTable();
>>> >> DataRow dr;
>>> >>
>>> >> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
>>> >>
>>> >> for (int i = 0; i < 2; i++)
>>> >> {
>>> >> dr = dt.NewRow();
>>> >> dr[0] = i;
>>> >> dt.Rows.Add(dr);
>>> >> }
>>> >>
>>> >> DataView dv = new DataView(dt);
>>> >> return dv;
>>> >> }
>>> >> }
>>> >

>>

>
>

[buzlite001@hotmail.com]

Hello Gaurav,

Thanks for you attempt but it was not answering the initial problem.

The initial problem was that the MyUserControl is embedded in a
Datagrid control. Please checkout the file WebForm1.aspx in my previous
email.

With the configuration as shown in WebForm1.aspx, the user control is
embedded in a datagrid control. When this file is executed and text is
entered into the user control textbox, LoadPostData() of the user
control is invoked. But even though LoadPostData() returns 'true', the
corresponding RaisePostDataChangedEvent() is not called. This is the
problem I am trying to find a solution to.

By the way, I am using Visual Studio.NET 2003 with .NET framework 1.1.
I think you are using Visual Studio.NET 2005 with .NET framework 2.0.
Nevertheless, I do not know if this would affect the result. I would
be curious though.

Thanks



Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

> Problem solved.
> btw, the hidden field would be required because of the following reason:
>
> For each ClientID that appears in the form and the control corresponding to
> the same, the IPostBackDataHandler methods would be called.
> And for no else.
>
> Here's a trick:
>
> Add a hidden field during 'Render' to the output.
>
> You may download the code (that I wrote) from the following URL:
> [url]http://www.edujini.in/samples/ASP.Net/2.0/DataHandlerControl.zip[/url]
>
>
> --
> Happy Hacking,
> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> -------------------
>
>
> "Gaurav Vaish (www.EduJini.IN)" <gaurav.vaish.nospam@nospam.gmail.com> wrote
> in message news:OOulE4BwGHA.1288@TK2MSFTNGP02.phx.gbl...

> > Let me give it a shot by creating a dummy 'UserControl' on my own.
> >
> > --
> > Happy Hacking,
> > Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> > [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> > -------------------
> >
> >
> > <buzlite@sympatico.ca> wrote in message
> > news:1155591996.737095.53890@b28g2000cwb.googlegro ups.com...

> >> Hello Gaurav,
> >>
> >> I do not know the reasoning for adding a hidden field and what purpose
> >> that would accomplish.
> >>
> >>>From the sample code attachments, when WebForm1.aspx is run and the
> >> Datagrid generates MyUserControl user control, any text that is entered
> >> in this user control TextBox would be properly posted back to the
> >> server. This is true in that when MyUserControl.ascx.cs,
> >> LoadPostData() is called, the data can be retrieved from the input
> >> parameter of this method. So...this is working OK.
> >>
> >> The problem is, when MyUserControl.ascx.cs, LoadPostData() returns a
> >> value of 'true', RaisePostDataChangedEvent() is never invoked. In the
> >> MyUserControl.ascx.cs code snippet, I hardcoded a return of 'true'.
> >> Even then, RaisePostDataChangedEvent() is never invoked. This is the
> >> main problem that I am experiencing.
> >>
> >> Any insights ?
> >>
> >> Thanks
> >>
> >>
> >>
> >> Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:
> >>> Hi,
> >>>
> >>> The only missing thing that will need to fill, as I think, is a simple
> >>> hidden field... so that it can be captured in LoadPostData.
> >>>
> >>> btw, what happens if you blindly return 'true' in LoadPostData?
> >>>
> >>>
> >>> --
> >>> Happy Hacking,
> >>> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> >>> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> >>> -------------------
> >>>
> >>>
> >>> <buzlite@sympatico.ca> wrote in message
> >>> news:1155567351.199524.188830@m79g2000cwm.googlegr oups.com...
> >>> > Hello All,
> >>> > Any help would be appreciated.
> >>> > Thanks
> >>> >
> >>> >
> >>> >
> >>> > [email]buzlite@sympatico.ca[/email] wrote:
> >>> >> Hello All,
> >>> >>
> >>> >>
> >>> >> I've posted this in
> >>> >> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
> >>> >> reply so I'll try my luck here.
> >>> >>
> >>> >> Any help would be greatly appreciated.
> >>> >> Thanks
> >>> >>
> >>> >>
> >>> >>
> >>> >> I am having some difficulties with a user control implementing
> >>> >> IPostBackDataHandler when it is placed inside a datagrid.
> >>> >>
> >>> >> I have created a user control (MyUserControl.ascx) containing 1
> >>> >> TextBox
> >>> >> that implements the IPostBackDataHandler.
> >>> >> I have also created a form (WebForm1.aspx) that contains 1 datagrid
> >>> >> of
> >>> >> which the datagrid contains the above user control as specified in
> >>> >> its
> >>> >> template.
> >>> >>
> >>> >> The purpose is to dynamically create one MyUserControl for each item
> >>> >> in
> >>> >> the datasource for display and editing.
> >>> >>
> >>> >> When the program is run and text is entered into MyUserControl's
> >>> >> textbox, the LoadPostData() of MyUserControl.ascx is called as
> >>> >> expected. But even though LoadPostData() returns true the
> >>> >> corresponding RaisePostDataChangedEvent() is not called.
> >>> >>
> >>> >>
> >>> >> Note: if I were to simply include the MyUserControl.ascx in
> >>> >> WebForm1.aspx, then both LoadPostData() and
> >>> >> RaisePostDataChangedEvent()
> >>> >> of MyUserControl.ascx are called as expected.
> >>> >>
> >>> >> Would someone give me some insight as to why this is not working ?
> >>> >> Am
> >>> >> I missing a step somewhere ?
> >>> >>
> >>> >>
> >>> >>
> >>> >> Attached is the bare essential code snippets to reproduce the
> >>> >> problem.
> >>> >>
> >>> >>
> >>> >> MyUserControl.ascx
> >>> >> -----------------------------------------------------
> >>> >> <%@ Control Language="c#" AutoEventWireup="false"
> >>> >> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
> >>> >> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
> >>> >> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
> >>> >>
> >>> >>
> >>> >> MyUserControl.ascx.cs
> >>> >> -----------------------------------------------------
> >>> >> public class MyUserControl : System.Web.UI.UserControl,
> >>> >> IPostBackDataHandler, INamingContainer
> >>> >> {
> >>> >> protected System.Web.UI.WebControls.TextBox TextBox1;
> >>> >>
> >>> >>
> >>> >> #region Web Form Designer generated code
> >>> >> override protected void OnInit(EventArgs e)
> >>> >> {
> >>> >> //
> >>> >> // CODEGEN: This call is required by the ASP.NET Web Form Designer.
> >>> >> //
> >>> >> InitializeComponent();
> >>> >> base.OnInit(e);
> >>> >>
> >>> >> if (Page != null)
> >>> >> {
> >>> >> Page.RegisterRequiresPostBack(this);
> >>> >> }
> >>> >> }
> >>> >>
> >>> >> /// <summary>
> >>> >> /// Required method for Designer support - do not modify
> >>> >> /// the contents of this method with the code editor.
> >>> >> /// </summary>
> >>> >> private void InitializeComponent()
> >>> >> {
> >>> >> this.Load += new System.EventHandler(this.Page_Load);
> >>> >>
> >>> >> }
> >>> >> #endregion
> >>> >>
> >>> >>
> >>> >> public virtual bool LoadPostData(string postDataKey,
> >>> >> System.Collections.Specialized.NameValueCollection postCollection)
> >>> >> {
> >>> >> return true;
> >>> >> }
> >>> >>
> >>> >> public virtual void RaisePostDataChangedEvent()
> >>> >> {
> >>> >> }
> >>> >>
> >>> >> private void Page_Load(object sender, System.EventArgs e)
> >>> >> {
> >>> >> }
> >>> >> }
> >>> >>
> >>> >>
> >>> >>
> >>> >> WebForm1.aspx
> >>> >> ------------------------------------------------------
> >>> >> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
> >>> >> Src="MyUserControl.ascx" %>
> >>> >> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
> >>> >> AutoEventWireup="false" Inherits="test.WebForm1" %>
> >>> >> ...
> >>> >> <form id="Form1" method="post" runat="server">
> >>> >> <asp:datagrid id="dgListing" runat="server"
> >>> >> AutoGenerateColumns="False">
> >>> >> <Columns>
> >>> >> <asp:TemplateColumn>
> >>> >> <ItemTemplate>
> >>> >> <f4c:MyUserControl id="MyUserControl1"
> >>> >> runat="server"></f4c:MyUserControl>
> >>> >> </ItemTemplate>
> >>> >> </asp:TemplateColumn>
> >>> >> </Columns>
> >>> >> </asp:datagrid>
> >>> >> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
> >>> >> </form>
> >>> >>
> >>> >>
> >>> >> WebForm1.aspx.cs
> >>> >> ------------------------------------------------------
> >>> >> public class WebForm1 : System.Web.UI.Page
> >>> >> {
> >>> >>
> >>> >> ...
> >>> >> private void Page_Load(object sender, System.EventArgs e)
> >>> >> {
> >>> >> //setup handlers
> >>> >> this.Button1.Click += new System.EventHandler(this.Button1_Click);
> >>> >>
> >>> >> //setup datagrid
> >>> >> dgListing.DataSource = this.CreateDataSource();
> >>> >> dgListing.DataBind();
> >>> >> }
> >>> >>
> >>> >> private void Button1_Click(object sender, System.EventArgs e)
> >>> >> {
> >>> >> }
> >>> >>
> >>> >> ICollection CreateDataSource()
> >>> >> {
> >>> >> DataTable dt = new DataTable();
> >>> >> DataRow dr;
> >>> >>
> >>> >> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
> >>> >>
> >>> >> for (int i = 0; i < 2; i++)
> >>> >> {
> >>> >> dr = dt.NewRow();
> >>> >> dr[0] = i;
> >>> >> dt.Rows.Add(dr);
> >>> >> }
> >>> >>
> >>> >> DataView dv = new DataView(dt);
> >>> >> return dv;
> >>> >> }
> >>> >> }
> >>> >
> >>

> >
> >

[Gaurav Vaish \(www.EduJini.IN\)]

No problem.
Embed the control in DataGrid.... should not be a problem.

Did you try using my control in DataGrid?

--
Happy Hacking,
Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
[url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
-------------------


<buzlite001@hotmail.com> wrote in message
news:1155671651.189969.144180@m79g2000cwm.googlegr oups.com...

> Hello Gaurav,
>
> Thanks for you attempt but it was not answering the initial problem.
>
> The initial problem was that the MyUserControl is embedded in a
> Datagrid control. Please checkout the file WebForm1.aspx in my previous
> email.
>
> With the configuration as shown in WebForm1.aspx, the user control is
> embedded in a datagrid control. When this file is executed and text is
> entered into the user control textbox, LoadPostData() of the user
> control is invoked. But even though LoadPostData() returns 'true', the
> corresponding RaisePostDataChangedEvent() is not called. This is the
> problem I am trying to find a solution to.
>
> By the way, I am using Visual Studio.NET 2003 with .NET framework 1.1.
> I think you are using Visual Studio.NET 2005 with .NET framework 2.0.
> Nevertheless, I do not know if this would affect the result. I would
> be curious though.
>
> Thanks
>
>
>
> Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

>> Problem solved.
>> btw, the hidden field would be required because of the following reason:
>>
>> For each ClientID that appears in the form and the control corresponding
>> to
>> the same, the IPostBackDataHandler methods would be called.
>> And for no else.
>>
>> Here's a trick:
>>
>> Add a hidden field during 'Render' to the output.
>>
>> You may download the code (that I wrote) from the following URL:
>> [url]http://www.edujini.in/samples/ASP.Net/2.0/DataHandlerControl.zip[/url]
>>
>>
>> --
>> Happy Hacking,
>> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
>> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
>> -------------------
>>
>>
>> "Gaurav Vaish (www.EduJini.IN)" <gaurav.vaish.nospam@nospam.gmail.com>
>> wrote
>> in message news:OOulE4BwGHA.1288@TK2MSFTNGP02.phx.gbl...

>> > Let me give it a shot by creating a dummy 'UserControl' on my own.
>> >
>> > --
>> > Happy Hacking,
>> > Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
>> > [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
>> > -------------------
>> >
>> >
>> > <buzlite@sympatico.ca> wrote in message
>> > news:1155591996.737095.53890@b28g2000cwb.googlegro ups.com...
>> >> Hello Gaurav,
>> >>
>> >> I do not know the reasoning for adding a hidden field and what purpose
>> >> that would accomplish.
>> >>
>> >>>From the sample code attachments, when WebForm1.aspx is run and the
>> >> Datagrid generates MyUserControl user control, any text that is
>> >> entered
>> >> in this user control TextBox would be properly posted back to the
>> >> server. This is true in that when MyUserControl.ascx.cs,
>> >> LoadPostData() is called, the data can be retrieved from the input
>> >> parameter of this method. So...this is working OK.
>> >>
>> >> The problem is, when MyUserControl.ascx.cs, LoadPostData() returns a
>> >> value of 'true', RaisePostDataChangedEvent() is never invoked. In the
>> >> MyUserControl.ascx.cs code snippet, I hardcoded a return of 'true'.
>> >> Even then, RaisePostDataChangedEvent() is never invoked. This is the
>> >> main problem that I am experiencing.
>> >>
>> >> Any insights ?
>> >>
>> >> Thanks
>> >>
>> >>
>> >>
>> >> Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:
>> >>> Hi,
>> >>>
>> >>> The only missing thing that will need to fill, as I think, is a
>> >>> simple
>> >>> hidden field... so that it can be captured in LoadPostData.
>> >>>
>> >>> btw, what happens if you blindly return 'true' in LoadPostData?
>> >>>
>> >>>
>> >>> --
>> >>> Happy Hacking,
>> >>> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
>> >>> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
>> >>> -------------------
>> >>>
>> >>>
>> >>> <buzlite@sympatico.ca> wrote in message
>> >>> news:1155567351.199524.188830@m79g2000cwm.googlegr oups.com...
>> >>> > Hello All,
>> >>> > Any help would be appreciated.
>> >>> > Thanks
>> >>> >
>> >>> >
>> >>> >
>> >>> > [email]buzlite@sympatico.ca[/email] wrote:
>> >>> >> Hello All,
>> >>> >>
>> >>> >>
>> >>> >> I've posted this in
>> >>> >> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got
>> >>> >> not
>> >>> >> reply so I'll try my luck here.
>> >>> >>
>> >>> >> Any help would be greatly appreciated.
>> >>> >> Thanks
>> >>> >>
>> >>> >>
>> >>> >>
>> >>> >> I am having some difficulties with a user control implementing
>> >>> >> IPostBackDataHandler when it is placed inside a datagrid.
>> >>> >>
>> >>> >> I have created a user control (MyUserControl.ascx) containing 1
>> >>> >> TextBox
>> >>> >> that implements the IPostBackDataHandler.
>> >>> >> I have also created a form (WebForm1.aspx) that contains 1
>> >>> >> datagrid
>> >>> >> of
>> >>> >> which the datagrid contains the above user control as specified in
>> >>> >> its
>> >>> >> template.
>> >>> >>
>> >>> >> The purpose is to dynamically create one MyUserControl for each
>> >>> >> item
>> >>> >> in
>> >>> >> the datasource for display and editing.
>> >>> >>
>> >>> >> When the program is run and text is entered into MyUserControl's
>> >>> >> textbox, the LoadPostData() of MyUserControl.ascx is called as
>> >>> >> expected. But even though LoadPostData() returns true the
>> >>> >> corresponding RaisePostDataChangedEvent() is not called.
>> >>> >>
>> >>> >>
>> >>> >> Note: if I were to simply include the MyUserControl.ascx in
>> >>> >> WebForm1.aspx, then both LoadPostData() and
>> >>> >> RaisePostDataChangedEvent()
>> >>> >> of MyUserControl.ascx are called as expected.
>> >>> >>
>> >>> >> Would someone give me some insight as to why this is not working ?
>> >>> >> Am
>> >>> >> I missing a step somewhere ?
>> >>> >>
>> >>> >>
>> >>> >>
>> >>> >> Attached is the bare essential code snippets to reproduce the
>> >>> >> problem.
>> >>> >>
>> >>> >>
>> >>> >> MyUserControl.ascx
>> >>> >> -----------------------------------------------------
>> >>> >> <%@ Control Language="c#" AutoEventWireup="false"
>> >>> >> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
>> >>> >> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
>> >>> >> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
>> >>> >>
>> >>> >>
>> >>> >> MyUserControl.ascx.cs
>> >>> >> -----------------------------------------------------
>> >>> >> public class MyUserControl : System.Web.UI.UserControl,
>> >>> >> IPostBackDataHandler, INamingContainer
>> >>> >> {
>> >>> >> protected System.Web.UI.WebControls.TextBox TextBox1;
>> >>> >>
>> >>> >>
>> >>> >> #region Web Form Designer generated code
>> >>> >> override protected void OnInit(EventArgs e)
>> >>> >> {
>> >>> >> //
>> >>> >> // CODEGEN: This call is required by the ASP.NET Web Form
>> >>> >> Designer.
>> >>> >> //
>> >>> >> InitializeComponent();
>> >>> >> base.OnInit(e);
>> >>> >>
>> >>> >> if (Page != null)
>> >>> >> {
>> >>> >> Page.RegisterRequiresPostBack(this);
>> >>> >> }
>> >>> >> }
>> >>> >>
>> >>> >> /// <summary>
>> >>> >> /// Required method for Designer support - do not modify
>> >>> >> /// the contents of this method with the code editor.
>> >>> >> /// </summary>
>> >>> >> private void InitializeComponent()
>> >>> >> {
>> >>> >> this.Load += new System.EventHandler(this.Page_Load);
>> >>> >>
>> >>> >> }
>> >>> >> #endregion
>> >>> >>
>> >>> >>
>> >>> >> public virtual bool LoadPostData(string postDataKey,
>> >>> >> System.Collections.Specialized.NameValueCollection postCollection)
>> >>> >> {
>> >>> >> return true;
>> >>> >> }
>> >>> >>
>> >>> >> public virtual void RaisePostDataChangedEvent()
>> >>> >> {
>> >>> >> }
>> >>> >>
>> >>> >> private void Page_Load(object sender, System.EventArgs e)
>> >>> >> {
>> >>> >> }
>> >>> >> }
>> >>> >>
>> >>> >>
>> >>> >>
>> >>> >> WebForm1.aspx
>> >>> >> ------------------------------------------------------
>> >>> >> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
>> >>> >> Src="MyUserControl.ascx" %>
>> >>> >> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
>> >>> >> AutoEventWireup="false" Inherits="test.WebForm1" %>
>> >>> >> ...
>> >>> >> <form id="Form1" method="post" runat="server">
>> >>> >> <asp:datagrid id="dgListing" runat="server"
>> >>> >> AutoGenerateColumns="False">
>> >>> >> <Columns>
>> >>> >> <asp:TemplateColumn>
>> >>> >> <ItemTemplate>
>> >>> >> <f4c:MyUserControl id="MyUserControl1"
>> >>> >> runat="server"></f4c:MyUserControl>
>> >>> >> </ItemTemplate>
>> >>> >> </asp:TemplateColumn>
>> >>> >> </Columns>
>> >>> >> </asp:datagrid>
>> >>> >> <asp:Button id="Button1" runat="server"
>> >>> >> Text="Button"></asp:Button>
>> >>> >> </form>
>> >>> >>
>> >>> >>
>> >>> >> WebForm1.aspx.cs
>> >>> >> ------------------------------------------------------
>> >>> >> public class WebForm1 : System.Web.UI.Page
>> >>> >> {
>> >>> >>
>> >>> >> ...
>> >>> >> private void Page_Load(object sender, System.EventArgs e)
>> >>> >> {
>> >>> >> //setup handlers
>> >>> >> this.Button1.Click += new System.EventHandler(this.Button1_Click);
>> >>> >>
>> >>> >> //setup datagrid
>> >>> >> dgListing.DataSource = this.CreateDataSource();
>> >>> >> dgListing.DataBind();
>> >>> >> }
>> >>> >>
>> >>> >> private void Button1_Click(object sender, System.EventArgs e)
>> >>> >> {
>> >>> >> }
>> >>> >>
>> >>> >> ICollection CreateDataSource()
>> >>> >> {
>> >>> >> DataTable dt = new DataTable();
>> >>> >> DataRow dr;
>> >>> >>
>> >>> >> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
>> >>> >>
>> >>> >> for (int i = 0; i < 2; i++)
>> >>> >> {
>> >>> >> dr = dt.NewRow();
>> >>> >> dr[0] = i;
>> >>> >> dt.Rows.Add(dr);
>> >>> >> }
>> >>> >>
>> >>> >> DataView dv = new DataView(dt);
>> >>> >> return dv;
>> >>> >> }
>> >>> >> }
>> >>> >
>> >>
>> >
>> >

>

[buzlite@sympatico.ca]

Yes I have. I had to adapt your code to Visual Studio.NET 2003 though.
It was exhibiting the same problem in that RaisePostDataChangedEvent()
of the user control is not being called even when LoadPostData() of the
user control returns 'true' back to the framework.

Hope you have better luck.




Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

> No problem.
> Embed the control in DataGrid.... should not be a problem.
>
> Did you try using my control in DataGrid?
>
> --
> Happy Hacking,
> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> -------------------
>
>
> <buzlite001@hotmail.com> wrote in message
> news:1155671651.189969.144180@m79g2000cwm.googlegr oups.com...

> > Hello Gaurav,
> >
> > Thanks for you attempt but it was not answering the initial problem.
> >
> > The initial problem was that the MyUserControl is embedded in a
> > Datagrid control. Please checkout the file WebForm1.aspx in my previous
> > email.
> >
> > With the configuration as shown in WebForm1.aspx, the user control is
> > embedded in a datagrid control. When this file is executed and text is
> > entered into the user control textbox, LoadPostData() of the user
> > control is invoked. But even though LoadPostData() returns 'true', the
> > corresponding RaisePostDataChangedEvent() is not called. This is the
> > problem I am trying to find a solution to.
> >
> > By the way, I am using Visual Studio.NET 2003 with .NET framework 1.1.
> > I think you are using Visual Studio.NET 2005 with .NET framework 2.0.
> > Nevertheless, I do not know if this would affect the result. I would
> > be curious though.
> >
> > Thanks
> >
> >
> >
> > Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:

> >> Problem solved.
> >> btw, the hidden field would be required because of the following reason:
> >>
> >> For each ClientID that appears in the form and the control corresponding
> >> to
> >> the same, the IPostBackDataHandler methods would be called.
> >> And for no else.
> >>
> >> Here's a trick:
> >>
> >> Add a hidden field during 'Render' to the output.
> >>
> >> You may download the code (that I wrote) from the following URL:
> >> [url]http://www.edujini.in/samples/ASP.Net/2.0/DataHandlerControl.zip[/url]
> >>
> >>
> >> --
> >> Happy Hacking,
> >> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> >> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> >> -------------------
> >>
> >>
> >> "Gaurav Vaish (www.EduJini.IN)" <gaurav.vaish.nospam@nospam.gmail.com>
> >> wrote
> >> in message news:OOulE4BwGHA.1288@TK2MSFTNGP02.phx.gbl...
> >> > Let me give it a shot by creating a dummy 'UserControl' on my own.
> >> >
> >> > --
> >> > Happy Hacking,
> >> > Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> >> > [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> >> > -------------------
> >> >
> >> >
> >> > <buzlite@sympatico.ca> wrote in message
> >> > news:1155591996.737095.53890@b28g2000cwb.googlegro ups.com...
> >> >> Hello Gaurav,
> >> >>
> >> >> I do not know the reasoning for adding a hidden field and what purpose
> >> >> that would accomplish.
> >> >>
> >> >>>From the sample code attachments, when WebForm1.aspx is run and the
> >> >> Datagrid generates MyUserControl user control, any text that is
> >> >> entered
> >> >> in this user control TextBox would be properly posted back to the
> >> >> server. This is true in that when MyUserControl.ascx.cs,
> >> >> LoadPostData() is called, the data can be retrieved from the input
> >> >> parameter of this method. So...this is working OK.
> >> >>
> >> >> The problem is, when MyUserControl.ascx.cs, LoadPostData() returns a
> >> >> value of 'true', RaisePostDataChangedEvent() is never invoked. In the
> >> >> MyUserControl.ascx.cs code snippet, I hardcoded a return of 'true'.
> >> >> Even then, RaisePostDataChangedEvent() is never invoked. This is the
> >> >> main problem that I am experiencing.
> >> >>
> >> >> Any insights ?
> >> >>
> >> >> Thanks
> >> >>
> >> >>
> >> >>
> >> >> Gaurav Vaish ([url]www.EduJini.IN[/url]) wrote:
> >> >>> Hi,
> >> >>>
> >> >>> The only missing thing that will need to fill, as I think, is a
> >> >>> simple
> >> >>> hidden field... so that it can be captured in LoadPostData.
> >> >>>
> >> >>> btw, what happens if you blindly return 'true' in LoadPostData?
> >> >>>
> >> >>>
> >> >>> --
> >> >>> Happy Hacking,
> >> >>> Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
> >> >>> [url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
> >> >>> -------------------
> >> >>>
> >> >>>
> >> >>> <buzlite@sympatico.ca> wrote in message
> >> >>> news:1155567351.199524.188830@m79g2000cwm.googlegr oups.com...
> >> >>> > Hello All,
> >> >>> > Any help would be appreciated.
> >> >>> > Thanks
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> > [email]buzlite@sympatico.ca[/email] wrote:
> >> >>> >> Hello All,
> >> >>> >>
> >> >>> >>
> >> >>> >> I've posted this in
> >> >>> >> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got
> >> >>> >> not
> >> >>> >> reply so I'll try my luck here.
> >> >>> >>
> >> >>> >> Any help would be greatly appreciated.
> >> >>> >> Thanks
> >> >>> >>
> >> >>> >>
> >> >>> >>
> >> >>> >> I am having some difficulties with a user control implementing
> >> >>> >> IPostBackDataHandler when it is placed inside a datagrid.
> >> >>> >>
> >> >>> >> I have created a user control (MyUserControl.ascx) containing 1
> >> >>> >> TextBox
> >> >>> >> that implements the IPostBackDataHandler.
> >> >>> >> I have also created a form (WebForm1.aspx) that contains 1
> >> >>> >> datagrid
> >> >>> >> of
> >> >>> >> which the datagrid contains the above user control as specified in
> >> >>> >> its
> >> >>> >> template.
> >> >>> >>
> >> >>> >> The purpose is to dynamically create one MyUserControl for each
> >> >>> >> item
> >> >>> >> in
> >> >>> >> the datasource for display and editing.
> >> >>> >>
> >> >>> >> When the program is run and text is entered into MyUserControl's
> >> >>> >> textbox, the LoadPostData() of MyUserControl.ascx is called as
> >> >>> >> expected. But even though LoadPostData() returns true the
> >> >>> >> corresponding RaisePostDataChangedEvent() is not called.
> >> >>> >>
> >> >>> >>
> >> >>> >> Note: if I were to simply include the MyUserControl.ascx in
> >> >>> >> WebForm1.aspx, then both LoadPostData() and
> >> >>> >> RaisePostDataChangedEvent()
> >> >>> >> of MyUserControl.ascx are called as expected.
> >> >>> >>
> >> >>> >> Would someone give me some insight as to why this is not working ?
> >> >>> >> Am
> >> >>> >> I missing a step somewhere ?
> >> >>> >>
> >> >>> >>
> >> >>> >>
> >> >>> >> Attached is the bare essential code snippets to reproduce the
> >> >>> >> problem.
> >> >>> >>
> >> >>> >>
> >> >>> >> MyUserControl.ascx
> >> >>> >> -----------------------------------------------------
> >> >>> >> <%@ Control Language="c#" AutoEventWireup="false"
> >> >>> >> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
> >> >>> >> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
> >> >>> >> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
> >> >>> >>
> >> >>> >>
> >> >>> >> MyUserControl.ascx.cs
> >> >>> >> -----------------------------------------------------
> >> >>> >> public class MyUserControl : System.Web.UI.UserControl,
> >> >>> >> IPostBackDataHandler, INamingContainer
> >> >>> >> {
> >> >>> >> protected System.Web.UI.WebControls.TextBox TextBox1;
> >> >>> >>
> >> >>> >>
> >> >>> >> #region Web Form Designer generated code
> >> >>> >> override protected void OnInit(EventArgs e)
> >> >>> >> {
> >> >>> >> //
> >> >>> >> // CODEGEN: This call is required by the ASP.NET Web Form
> >> >>> >> Designer.
> >> >>> >> //
> >> >>> >> InitializeComponent();
> >> >>> >> base.OnInit(e);
> >> >>> >>
> >> >>> >> if (Page != null)
> >> >>> >> {
> >> >>> >> Page.RegisterRequiresPostBack(this);
> >> >>> >> }
> >> >>> >> }
> >> >>> >>
> >> >>> >> /// <summary>
> >> >>> >> /// Required method for Designer support - do not modify
> >> >>> >> /// the contents of this method with the code editor.
> >> >>> >> /// </summary>
> >> >>> >> private void InitializeComponent()
> >> >>> >> {
> >> >>> >> this.Load += new System.EventHandler(this.Page_Load);
> >> >>> >>
> >> >>> >> }
> >> >>> >> #endregion
> >> >>> >>
> >> >>> >>
> >> >>> >> public virtual bool LoadPostData(string postDataKey,
> >> >>> >> System.Collections.Specialized.NameValueCollection postCollection)
> >> >>> >> {
> >> >>> >> return true;
> >> >>> >> }
> >> >>> >>
> >> >>> >> public virtual void RaisePostDataChangedEvent()
> >> >>> >> {
> >> >>> >> }
> >> >>> >>
> >> >>> >> private void Page_Load(object sender, System.EventArgs e)
> >> >>> >> {
> >> >>> >> }
> >> >>> >> }
> >> >>> >>
> >> >>> >>
> >> >>> >>
> >> >>> >> WebForm1.aspx
> >> >>> >> ------------------------------------------------------
> >> >>> >> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
> >> >>> >> Src="MyUserControl.ascx" %>
> >> >>> >> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
> >> >>> >> AutoEventWireup="false" Inherits="test.WebForm1" %>
> >> >>> >> ...
> >> >>> >> <form id="Form1" method="post" runat="server">
> >> >>> >> <asp:datagrid id="dgListing" runat="server"
> >> >>> >> AutoGenerateColumns="False">
> >> >>> >> <Columns>
> >> >>> >> <asp:TemplateColumn>
> >> >>> >> <ItemTemplate>
> >> >>> >> <f4c:MyUserControl id="MyUserControl1"
> >> >>> >> runat="server"></f4c:MyUserControl>
> >> >>> >> </ItemTemplate>
> >> >>> >> </asp:TemplateColumn>
> >> >>> >> </Columns>
> >> >>> >> </asp:datagrid>
> >> >>> >> <asp:Button id="Button1" runat="server"
> >> >>> >> Text="Button"></asp:Button>
> >> >>> >> </form>
> >> >>> >>
> >> >>> >>
> >> >>> >> WebForm1.aspx.cs
> >> >>> >> ------------------------------------------------------
> >> >>> >> public class WebForm1 : System.Web.UI.Page
> >> >>> >> {
> >> >>> >>
> >> >>> >> ...
> >> >>> >> private void Page_Load(object sender, System.EventArgs e)
> >> >>> >> {
> >> >>> >> //setup handlers
> >> >>> >> this.Button1.Click += new System.EventHandler(this.Button1_Click);
> >> >>> >>
> >> >>> >> //setup datagrid
> >> >>> >> dgListing.DataSource = this.CreateDataSource();
> >> >>> >> dgListing.DataBind();
> >> >>> >> }
> >> >>> >>
> >> >>> >> private void Button1_Click(object sender, System.EventArgs e)
> >> >>> >> {
> >> >>> >> }
> >> >>> >>
> >> >>> >> ICollection CreateDataSource()
> >> >>> >> {
> >> >>> >> DataTable dt = new DataTable();
> >> >>> >> DataRow dr;
> >> >>> >>
> >> >>> >> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
> >> >>> >>
> >> >>> >> for (int i = 0; i < 2; i++)
> >> >>> >> {
> >> >>> >> dr = dt.NewRow();
> >> >>> >> dr[0] = i;
> >> >>> >> dt.Rows.Add(dr);
> >> >>> >> }
> >> >>> >>
> >> >>> >> DataView dv = new DataView(dt);
> >> >>> >> return dv;
> >> >>> >> }
> >> >>> >> }
> >> >>> >
> >> >>
> >> >
> >> >

> >

[Alessandro Zifiglio]

hi, the reason your postDataChanged event never makes it is because you have
the user control nested in a datagrid. The datagrid control internally
overrides the onBubbleEvent, and only raises command event, to which you can
get to using the ItemCommand method exposed by the datagrid, giving you a
central location to branch out. Only command events are raised and exposed
via the ItemCommand method because command events can contain CommandName
and CommandArgument properties which can futher be used to distinguish
between who fired what event(stored by you in CommandName property), and
also a chance to pass some custom data(via the commandArgument property) .

In your case you want to fire a non command event, so
1. Nothing will be fired in the DataGrids ItemCommand, and
2. the event is supressed since onbubble event is overridden by the datagrid
and no action is provided to handle any events raised other than command
events.

To work around, you can expose a textchanged event by your usercontrol
class, and attach the event declaratively as the following code snippet,
note OnTextChanged="WebUserControl11_TextChanged".

Another mistake i have seen in your code is that you rebind your datagrid in
page_load, whether its postback or not. If you do this, then the datagrid
will rebind, rebuilding everything and you lose state. This also will
execute before you user control gets a chance to inspect postdata changes.
So only rebind the grid, if its not a postback scenario.

Regards,
Alessandro Zifiglio
[url]http://www.AsyncUI.net[/url]


<asp:DataGrid id="DataGrid1" runat="server" EnableViewState="True"
AutoGenerateColumns="False">
<Columns>
<asp:TemplateColumn HeaderText="Template Column1">
<ItemTemplate>
<uc1:WebUserControl1 id="WebUserControl11"
OnTextChanged="WebUserControl11_TextChanged"
runat="server"></uc1:WebUserControl1>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>


public void WebUserControl11_TextChanged(object sender, System.EventArgs e)
{
string text1 = (string)((WebUserControl1)sender).Text;
Response.Write(text1);
}


In your user control class you would be doing this to expose the public
event :
----------------------------------------------------------------------------------


public class WebUserControl1 : System.Web.UI.UserControl,
System.Web.UI.IPostBackDataHandler, System.Web.UI.INamingContainer
{
protected System.Web.UI.WebControls.TextBox TextBox1;

public event EventHandler TextChanged;
public string Text
{
get
{
return this.TextBox1.Text;
}

set
{
this.TextBox1.Text = value;
}
}

// return true only if the text has changed
// otherwise false.
public virtual bool LoadPostData(string postDataKey, NameValueCollection
postCollection)
{

String presentValue = Text;
String postedValue = postCollection[postDataKey];
if (postedValue == null)
postedValue = string.Empty;
if (!presentValue.Equals(postedValue))
{
return true;
}
return false;
}

public virtual void RaisePostDataChangedEvent()
{
OnTextChanged(EventArgs.Empty);
}

protected virtual void OnTextChanged(EventArgs e)
{
if (TextChanged != null)
TextChanged(this,e);
}

override protected void OnInit(EventArgs e)
{
InitializeComponent();
base.OnInit(e);

if (Page != null)
{
Page.RegisterRequiresPostBack(this);
}

}


<buzlite@sympatico.ca> ha scritto nel messaggio
news:1155336658.977686.265490@p79g2000cwp.googlegr oups.com...

> Hello All,
>
>
> I've posted this in
> microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
> reply so I'll try my luck here.
>
> Any help would be greatly appreciated.
> Thanks
>
>
>
> I am having some difficulties with a user control implementing
> IPostBackDataHandler when it is placed inside a datagrid.
>
> I have created a user control (MyUserControl.ascx) containing 1 TextBox
> that implements the IPostBackDataHandler.
> I have also created a form (WebForm1.aspx) that contains 1 datagrid of
> which the datagrid contains the above user control as specified in its
> template.
>
> The purpose is to dynamically create one MyUserControl for each item in
> the datasource for display and editing.
>
> When the program is run and text is entered into MyUserControl's
> textbox, the LoadPostData() of MyUserControl.ascx is called as
> expected. But even though LoadPostData() returns true the
> corresponding RaisePostDataChangedEvent() is not called.
>
>
> Note: if I were to simply include the MyUserControl.ascx in
> WebForm1.aspx, then both LoadPostData() and RaisePostDataChangedEvent()
> of MyUserControl.ascx are called as expected.
>
> Would someone give me some insight as to why this is not working ? Am
> I missing a step somewhere ?
>
>
>
> Attached is the bare essential code snippets to reproduce the problem.
>
>
> MyUserControl.ascx
> -----------------------------------------------------
> <%@ Control Language="c#" AutoEventWireup="false"
> Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
> TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
> <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
>
>
> MyUserControl.ascx.cs
> -----------------------------------------------------
> public class MyUserControl : System.Web.UI.UserControl,
> IPostBackDataHandler, INamingContainer
> {
> protected System.Web.UI.WebControls.TextBox TextBox1;
>
>
> #region Web Form Designer generated code
> override protected void OnInit(EventArgs e)
> {
> //
> // CODEGEN: This call is required by the ASP.NET Web Form Designer.
> //
> InitializeComponent();
> base.OnInit(e);
>
> if (Page != null)
> {
> Page.RegisterRequiresPostBack(this);
> }
> }
>
> /// <summary>
> /// Required method for Designer support - do not modify
> /// the contents of this method with the code editor.
> /// </summary>
> private void InitializeComponent()
> {
> this.Load += new System.EventHandler(this.Page_Load);
>
> }
> #endregion
>
>
> public virtual bool LoadPostData(string postDataKey,
> System.Collections.Specialized.NameValueCollection postCollection)
> {
> return true;
> }
>
> public virtual void RaisePostDataChangedEvent()
> {
> }
>
> private void Page_Load(object sender, System.EventArgs e)
> {
> }
> }
>
>
>
> WebForm1.aspx
> ------------------------------------------------------
> <%@ Register TagPrefix="f4c" TagName="MyUserControl"
> Src="MyUserControl.ascx" %>
> <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
> AutoEventWireup="false" Inherits="test.WebForm1" %>
> ...
> <form id="Form1" method="post" runat="server">
> <asp:datagrid id="dgListing" runat="server"
> AutoGenerateColumns="False">
> <Columns>
> <asp:TemplateColumn>
> <ItemTemplate>
> <f4c:MyUserControl id="MyUserControl1"
> runat="server"></f4c:MyUserControl>
> </ItemTemplate>
> </asp:TemplateColumn>
> </Columns>
> </asp:datagrid>
> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
> </form>
>
>
> WebForm1.aspx.cs
> ------------------------------------------------------
> public class WebForm1 : System.Web.UI.Page
> {
>
> ...
> private void Page_Load(object sender, System.EventArgs e)
> {
> //setup handlers
> this.Button1.Click += new System.EventHandler(this.Button1_Click);
>
> //setup datagrid
> dgListing.DataSource = this.CreateDataSource();
> dgListing.DataBind();
> }
>
> private void Button1_Click(object sender, System.EventArgs e)
> {
> }
>
> ICollection CreateDataSource()
> {
> DataTable dt = new DataTable();
> DataRow dr;
>
> dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
>
> for (int i = 0; i < 2; i++)
> {
> dr = dt.NewRow();
> dr[0] = i;
> dt.Rows.Add(dr);
> }
>
> DataView dv = new DataView(dt);
> return dv;
> }
> }
>

[buzlite@sympatico.ca]

Thanks for the help Alessandro. Your explanation was very insightful.
Your code snippet worked like a charm.

Gaurav, if you're reading this posting, thanks to you too for helping.

Have a great day All.



Alessandro Zifiglio wrote:

> hi, the reason your postDataChanged event never makes it is because you have
> the user control nested in a datagrid. The datagrid control internally
> overrides the onBubbleEvent, and only raises command event, to which you can
> get to using the ItemCommand method exposed by the datagrid, giving you a
> central location to branch out. Only command events are raised and exposed
> via the ItemCommand method because command events can contain CommandName
> and CommandArgument properties which can futher be used to distinguish
> between who fired what event(stored by you in CommandName property), and
> also a chance to pass some custom data(via the commandArgument property) .
>
> In your case you want to fire a non command event, so
> 1. Nothing will be fired in the DataGrids ItemCommand, and
> 2. the event is supressed since onbubble event is overridden by the datagrid
> and no action is provided to handle any events raised other than command
> events.
>
> To work around, you can expose a textchanged event by your usercontrol
> class, and attach the event declaratively as the following code snippet,
> note OnTextChanged="WebUserControl11_TextChanged".
>
> Another mistake i have seen in your code is that you rebind your datagrid in
> page_load, whether its postback or not. If you do this, then the datagrid
> will rebind, rebuilding everything and you lose state. This also will
> execute before you user control gets a chance to inspect postdata changes.
> So only rebind the grid, if its not a postback scenario.
>
> Regards,
> Alessandro Zifiglio
> [url]http://www.AsyncUI.net[/url]
>
>
> <asp:DataGrid id="DataGrid1" runat="server" EnableViewState="True"
> AutoGenerateColumns="False">
> <Columns>
> <asp:TemplateColumn HeaderText="Template Column1">
> <ItemTemplate>
> <uc1:WebUserControl1 id="WebUserControl11"
> OnTextChanged="WebUserControl11_TextChanged"
> runat="server"></uc1:WebUserControl1>
> </ItemTemplate>
> </asp:TemplateColumn>
> </Columns>
> </asp:DataGrid>
>
>
> public void WebUserControl11_TextChanged(object sender, System.EventArgs e)
> {
> string text1 = (string)((WebUserControl1)sender).Text;
> Response.Write(text1);
> }
>
>
> In your user control class you would be doing this to expose the public
> event :
> ----------------------------------------------------------------------------------
>
>
> public class WebUserControl1 : System.Web.UI.UserControl,
> System.Web.UI.IPostBackDataHandler, System.Web.UI.INamingContainer
> {
> protected System.Web.UI.WebControls.TextBox TextBox1;
>
> public event EventHandler TextChanged;
> public string Text
> {
> get
> {
> return this.TextBox1.Text;
> }
>
> set
> {
> this.TextBox1.Text = value;
> }
> }
>
> // return true only if the text has changed
> // otherwise false.
> public virtual bool LoadPostData(string postDataKey, NameValueCollection
> postCollection)
> {
>
> String presentValue = Text;
> String postedValue = postCollection[postDataKey];
> if (postedValue == null)
> postedValue = string.Empty;
> if (!presentValue.Equals(postedValue))
> {
> return true;
> }
> return false;
> }
>
> public virtual void RaisePostDataChangedEvent()
> {
> OnTextChanged(EventArgs.Empty);
> }
>
> protected virtual void OnTextChanged(EventArgs e)
> {
> if (TextChanged != null)
> TextChanged(this,e);
> }
>
> override protected void OnInit(EventArgs e)
> {
> InitializeComponent();
> base.OnInit(e);
>
> if (Page != null)
> {
> Page.RegisterRequiresPostBack(this);
> }
>
> }
>
>
> <buzlite@sympatico.ca> ha scritto nel messaggio
> news:1155336658.977686.265490@p79g2000cwp.googlegr oups.com...

> > Hello All,
> >
> >
> > I've posted this in
> > microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
> > reply so I'll try my luck here.
> >
> > Any help would be greatly appreciated.
> > Thanks
> >
> >
> >
> > I am having some difficulties with a user control implementing
> > IPostBackDataHandler when it is placed inside a datagrid.
> >
> > I have created a user control (MyUserControl.ascx) containing 1 TextBox
> > that implements the IPostBackDataHandler.
> > I have also created a form (WebForm1.aspx) that contains 1 datagrid of
> > which the datagrid contains the above user control as specified in its
> > template.
> >
> > The purpose is to dynamically create one MyUserControl for each item in
> > the datasource for display and editing.
> >
> > When the program is run and text is entered into MyUserControl's
> > textbox, the LoadPostData() of MyUserControl.ascx is called as
> > expected. But even though LoadPostData() returns true the
> > corresponding RaisePostDataChangedEvent() is not called.
> >
> >
> > Note: if I were to simply include the MyUserControl.ascx in
> > WebForm1.aspx, then both LoadPostData() and RaisePostDataChangedEvent()
> > of MyUserControl.ascx are called as expected.
> >
> > Would someone give me some insight as to why this is not working ? Am
> > I missing a step somewhere ?
> >
> >
> >
> > Attached is the bare essential code snippets to reproduce the problem.
> >
> >
> > MyUserControl.ascx
> > -----------------------------------------------------
> > <%@ Control Language="c#" AutoEventWireup="false"
> > Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
> > TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
> > <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
> >
> >
> > MyUserControl.ascx.cs
> > -----------------------------------------------------
> > public class MyUserControl : System.Web.UI.UserControl,
> > IPostBackDataHandler, INamingContainer
> > {
> > protected System.Web.UI.WebControls.TextBox TextBox1;
> >
> >
> > #region Web Form Designer generated code
> > override protected void OnInit(EventArgs e)
> > {
> > //
> > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
> > //
> > InitializeComponent();
> > base.OnInit(e);
> >
> > if (Page != null)
> > {
> > Page.RegisterRequiresPostBack(this);
> > }
> > }
> >
> > /// <summary>
> > /// Required method for Designer support - do not modify
> > /// the contents of this method with the code editor.
> > /// </summary>
> > private void InitializeComponent()
> > {
> > this.Load += new System.EventHandler(this.Page_Load);
> >
> > }
> > #endregion
> >
> >
> > public virtual bool LoadPostData(string postDataKey,
> > System.Collections.Specialized.NameValueCollection postCollection)
> > {
> > return true;
> > }
> >
> > public virtual void RaisePostDataChangedEvent()
> > {
> > }
> >
> > private void Page_Load(object sender, System.EventArgs e)
> > {
> > }
> > }
> >
> >
> >
> > WebForm1.aspx
> > ------------------------------------------------------
> > <%@ Register TagPrefix="f4c" TagName="MyUserControl"
> > Src="MyUserControl.ascx" %>
> > <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
> > AutoEventWireup="false" Inherits="test.WebForm1" %>
> > ...
> > <form id="Form1" method="post" runat="server">
> > <asp:datagrid id="dgListing" runat="server"
> > AutoGenerateColumns="False">
> > <Columns>
> > <asp:TemplateColumn>
> > <ItemTemplate>
> > <f4c:MyUserControl id="MyUserControl1"
> > runat="server"></f4c:MyUserControl>
> > </ItemTemplate>
> > </asp:TemplateColumn>
> > </Columns>
> > </asp:datagrid>
> > <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
> > </form>
> >
> >
> > WebForm1.aspx.cs
> > ------------------------------------------------------
> > public class WebForm1 : System.Web.UI.Page
> > {
> >
> > ...
> > private void Page_Load(object sender, System.EventArgs e)
> > {
> > //setup handlers
> > this.Button1.Click += new System.EventHandler(this.Button1_Click);
> >
> > //setup datagrid
> > dgListing.DataSource = this.CreateDataSource();
> > dgListing.DataBind();
> > }
> >
> > private void Button1_Click(object sender, System.EventArgs e)
> > {
> > }
> >
> > ICollection CreateDataSource()
> > {
> > DataTable dt = new DataTable();
> > DataRow dr;
> >
> > dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
> >
> > for (int i = 0; i < 2; i++)
> > {
> > dr = dt.NewRow();
> > dr[0] = i;
> > dt.Rows.Add(dr);
> > }
> >
> > DataView dv = new DataView(dt);
> > return dv;
> > }
> > }
> >

[Alessandro Zifiglio]

your welcome.

Regards,
Alessandro Zifiglio
[url]http://www.AsyncUI.net[/url]

<buzlite@sympatico.ca> ha scritto nel messaggio
news:1155919853.934639.117020@i3g2000cwc.googlegro ups.com...

> Thanks for the help Alessandro. Your explanation was very insightful.
> Your code snippet worked like a charm.
>
> Gaurav, if you're reading this posting, thanks to you too for helping.
>
> Have a great day All.
>
>
>
> Alessandro Zifiglio wrote:

>> hi, the reason your postDataChanged event never makes it is because you
>> have
>> the user control nested in a datagrid. The datagrid control internally
>> overrides the onBubbleEvent, and only raises command event, to which you
>> can
>> get to using the ItemCommand method exposed by the datagrid, giving you a
>> central location to branch out. Only command events are raised and
>> exposed
>> via the ItemCommand method because command events can contain CommandName
>> and CommandArgument properties which can futher be used to distinguish
>> between who fired what event(stored by you in CommandName property), and
>> also a chance to pass some custom data(via the commandArgument property)
>> .
>>
>> In your case you want to fire a non command event, so
>> 1. Nothing will be fired in the DataGrids ItemCommand, and
>> 2. the event is supressed since onbubble event is overridden by the
>> datagrid
>> and no action is provided to handle any events raised other than command
>> events.
>>
>> To work around, you can expose a textchanged event by your usercontrol
>> class, and attach the event declaratively as the following code snippet,
>> note OnTextChanged="WebUserControl11_TextChanged".
>>
>> Another mistake i have seen in your code is that you rebind your datagrid
>> in
>> page_load, whether its postback or not. If you do this, then the datagrid
>> will rebind, rebuilding everything and you lose state. This also will
>> execute before you user control gets a chance to inspect postdata
>> changes.
>> So only rebind the grid, if its not a postback scenario.
>>
>> Regards,
>> Alessandro Zifiglio
>> [url]http://www.AsyncUI.net[/url]
>>
>>
>> <asp:DataGrid id="DataGrid1" runat="server" EnableViewState="True"
>> AutoGenerateColumns="False">
>> <Columns>
>> <asp:TemplateColumn HeaderText="Template Column1">
>> <ItemTemplate>
>> <uc1:WebUserControl1 id="WebUserControl11"
>> OnTextChanged="WebUserControl11_TextChanged"
>> runat="server"></uc1:WebUserControl1>
>> </ItemTemplate>
>> </asp:TemplateColumn>
>> </Columns>
>> </asp:DataGrid>
>>
>>
>> public void WebUserControl11_TextChanged(object sender, System.EventArgs
>> e)
>> {
>> string text1 = (string)((WebUserControl1)sender).Text;
>> Response.Write(text1);
>> }
>>
>>
>> In your user control class you would be doing this to expose the public
>> event :
>> ----------------------------------------------------------------------------------
>>
>>
>> public class WebUserControl1 : System.Web.UI.UserControl,
>> System.Web.UI.IPostBackDataHandler, System.Web.UI.INamingContainer
>> {
>> protected System.Web.UI.WebControls.TextBox TextBox1;
>>
>> public event EventHandler TextChanged;
>> public string Text
>> {
>> get
>> {
>> return this.TextBox1.Text;
>> }
>>
>> set
>> {
>> this.TextBox1.Text = value;
>> }
>> }
>>
>> // return true only if the text has changed
>> // otherwise false.
>> public virtual bool LoadPostData(string postDataKey,
>> NameValueCollection
>> postCollection)
>> {
>>
>> String presentValue = Text;
>> String postedValue = postCollection[postDataKey];
>> if (postedValue == null)
>> postedValue = string.Empty;
>> if (!presentValue.Equals(postedValue))
>> {
>> return true;
>> }
>> return false;
>> }
>>
>> public virtual void RaisePostDataChangedEvent()
>> {
>> OnTextChanged(EventArgs.Empty);
>> }
>>
>> protected virtual void OnTextChanged(EventArgs e)
>> {
>> if (TextChanged != null)
>> TextChanged(this,e);
>> }
>>
>> override protected void OnInit(EventArgs e)
>> {
>> InitializeComponent();
>> base.OnInit(e);
>>
>> if (Page != null)
>> {
>> Page.RegisterRequiresPostBack(this);
>> }
>>
>> }
>>
>>
>> <buzlite@sympatico.ca> ha scritto nel messaggio
>> news:1155336658.977686.265490@p79g2000cwp.googlegr oups.com...

>> > Hello All,
>> >
>> >
>> > I've posted this in
>> > microsoft.public.dotnet.framework.aspnet.datagridc ontrol but got not
>> > reply so I'll try my luck here.
>> >
>> > Any help would be greatly appreciated.
>> > Thanks
>> >
>> >
>> >
>> > I am having some difficulties with a user control implementing
>> > IPostBackDataHandler when it is placed inside a datagrid.
>> >
>> > I have created a user control (MyUserControl.ascx) containing 1 TextBox
>> > that implements the IPostBackDataHandler.
>> > I have also created a form (WebForm1.aspx) that contains 1 datagrid of
>> > which the datagrid contains the above user control as specified in its
>> > template.
>> >
>> > The purpose is to dynamically create one MyUserControl for each item in
>> > the datasource for display and editing.
>> >
>> > When the program is run and text is entered into MyUserControl's
>> > textbox, the LoadPostData() of MyUserControl.ascx is called as
>> > expected. But even though LoadPostData() returns true the
>> > corresponding RaisePostDataChangedEvent() is not called.
>> >
>> >
>> > Note: if I were to simply include the MyUserControl.ascx in
>> > WebForm1.aspx, then both LoadPostData() and RaisePostDataChangedEvent()
>> > of MyUserControl.ascx are called as expected.
>> >
>> > Would someone give me some insight as to why this is not working ? Am
>> > I missing a step somewhere ?
>> >
>> >
>> >
>> > Attached is the bare essential code snippets to reproduce the problem.
>> >
>> >
>> > MyUserControl.ascx
>> > -----------------------------------------------------
>> > <%@ Control Language="c#" AutoEventWireup="false"
>> > Codebehind="MyUserControl.ascx.cs" Inherits="test.MyUserControl"
>> > TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
>> > <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
>> >
>> >
>> > MyUserControl.ascx.cs
>> > -----------------------------------------------------
>> > public class MyUserControl : System.Web.UI.UserControl,
>> > IPostBackDataHandler, INamingContainer
>> > {
>> > protected System.Web.UI.WebControls.TextBox TextBox1;
>> >
>> >
>> > #region Web Form Designer generated code
>> > override protected void OnInit(EventArgs e)
>> > {
>> > //
>> > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
>> > //
>> > InitializeComponent();
>> > base.OnInit(e);
>> >
>> > if (Page != null)
>> > {
>> > Page.RegisterRequiresPostBack(this);
>> > }
>> > }
>> >
>> > /// <summary>
>> > /// Required method for Designer support - do not modify
>> > /// the contents of this method with the code editor.
>> > /// </summary>
>> > private void InitializeComponent()
>> > {
>> > this.Load += new System.EventHandler(this.Page_Load);
>> >
>> > }
>> > #endregion
>> >
>> >
>> > public virtual bool LoadPostData(string postDataKey,
>> > System.Collections.Specialized.NameValueCollection postCollection)
>> > {
>> > return true;
>> > }
>> >
>> > public virtual void RaisePostDataChangedEvent()
>> > {
>> > }
>> >
>> > private void Page_Load(object sender, System.EventArgs e)
>> > {
>> > }
>> > }
>> >
>> >
>> >
>> > WebForm1.aspx
>> > ------------------------------------------------------
>> > <%@ Register TagPrefix="f4c" TagName="MyUserControl"
>> > Src="MyUserControl.ascx" %>
>> > <%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
>> > AutoEventWireup="false" Inherits="test.WebForm1" %>
>> > ...
>> > <form id="Form1" method="post" runat="server">
>> > <asp:datagrid id="dgListing" runat="server"
>> > AutoGenerateColumns="False">
>> > <Columns>
>> > <asp:TemplateColumn>
>> > <ItemTemplate>
>> > <f4c:MyUserControl id="MyUserControl1"
>> > runat="server"></f4c:MyUserControl>
>> > </ItemTemplate>
>> > </asp:TemplateColumn>
>> > </Columns>
>> > </asp:datagrid>
>> > <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
>> > </form>
>> >
>> >
>> > WebForm1.aspx.cs
>> > ------------------------------------------------------
>> > public class WebForm1 : System.Web.UI.Page
>> > {
>> >
>> > ...
>> > private void Page_Load(object sender, System.EventArgs e)
>> > {
>> > //setup handlers
>> > this.Button1.Click += new System.EventHandler(this.Button1_Click);
>> >
>> > //setup datagrid
>> > dgListing.DataSource = this.CreateDataSource();
>> > dgListing.DataBind();
>> > }
>> >
>> > private void Button1_Click(object sender, System.EventArgs e)
>> > {
>> > }
>> >
>> > ICollection CreateDataSource()
>> > {
>> > DataTable dt = new DataTable();
>> > DataRow dr;
>> >
>> > dt.Columns.Add(new DataColumn("SomeColumn", typeof(Int32)));
>> >
>> > for (int i = 0; i < 2; i++)
>> > {
>> > dr = dt.NewRow();
>> > dr[0] = i;
>> > dt.Rows.Add(dr);
>> > }
>> >
>> > DataView dv = new DataView(dt);
>> > return dv;
>> > }
>> > }
>> >

>

[Gaurav Vaish \(www.EduJini.IN\)]

> Gaurav, if you're reading this posting, thanks to you too for helping.

Always welcome... :-)


--
Happy Hacking,
Gaurav Vaish | [url]http://www.mastergaurav.org[/url]
[url]http://www.edujini.in[/url] | [url]http://webservices.edujini.in[/url]
-------------------