Problem with DataBinding and CheckBoxList

[John Saunders]

What does your Page_Load look like?
--
John Saunders
Internet Engineer
[email]john.saunders@surfcontrol.com[/email]

"Eric Johannsen" <funmx@hotmail.com> wrote in message
news:uPlZa.2$%p6.739429@newssvr14.news.prodigy.com ...

> Hi all,
>
> I have a business object with some boolean fields. They need to be
> represented as a CheckBoxList on an aspx page. I do the data binding just
> like in the examples and everything displays just fine. However, when I

go

> to read out the new values from chklAvoid (my CheckBoxList), accessing
> chklAvoid[0] produces an error.
>
> When I do a Quick Watch on that variable, I note that the embedded
> ListControl's items.listItems property has a count of 0. Normally this
> would contain my bound items as far as I understand.
>
> HELP!
>
> Thanks,
>
> Eric
>
> Code follows:
>
> test.aspx:
> =========
> <asp:CheckBoxList id="chklAvoid" runat="server" DataSource="<%#
> this.createDataSourceAvoid() %>" DataValueField="BoolValue"
> DataTextField="Name">
> </asp:CheckBoxList>
>
> test.aspx.cs:
> ============
> private DataRow getCheckboxRow(DataTable dt, bool isChecked, string name)
> {
> DataRow dr = dt.NewRow();
> dr[0] = isChecked;
> dr[1] = name;
> return dr;
> }
>
> protected ICollection createDataSourceAvoid()
> {
> DataTable dt = new DataTable();
> dt.Columns.Add(new DataColumn("BoolValue", typeof(bool)));
> dt.Columns.Add(new DataColumn("Name", typeof(string)));
> dt.Rows.Add(getCheckboxRow(dt, myObject.Boolean1, "Text for boolean
> 1"));
> dt.Rows.Add(getCheckboxRow(dt, myObject.Boolean2, "Text for boolean
> 2"));
> DataView dv = new DataView(dt);
> return dv;
> }
>
> private void btnUpdate_Click(object sender, System.EventArgs e)
> {
> mCustomer.AvoidBreads = chklAvoid.Items[0].Selected;
> mCustomer.AvoidDairy = chklAvoid.Items[1].Selected;
> }
>
>

[Eric Johannsen]

Don't have the code in front of me right now, but it's very much like
this:

Page_Load(... standard parms ...)
{
if (!IsPostBack) DataBind();
}

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[Rick Strahl [MVP]]

Is ViewState enabled on the form and on the control? Without you'd have to
rebind each time and if you do you loose the state (selection) of the
control.

+++ Rick ---

--

Rick Strahl
West Wind Technologies
[url]http://www.west-wind.com/[/url]
[url]http://www.west-wind.com/wwHelp[/url]
----------------------------------
Making waves on the Web



"Eric Johannsen" <funmx@hotmail.com> wrote in message
news:uPlZa.2$%p6.739429@newssvr14.news.prodigy.com ...

> Hi all,
>
> I have a business object with some boolean fields. They need to be
> represented as a CheckBoxList on an aspx page. I do the data binding just
> like in the examples and everything displays just fine. However, when I

go

> to read out the new values from chklAvoid (my CheckBoxList), accessing
> chklAvoid[0] produces an error.
>
> When I do a Quick Watch on that variable, I note that the embedded
> ListControl's items.listItems property has a count of 0. Normally this
> would contain my bound items as far as I understand.
>
> HELP!
>
> Thanks,
>
> Eric
>
> Code follows:
>
> test.aspx:
> =========
> <asp:CheckBoxList id="chklAvoid" runat="server" DataSource="<%#
> this.createDataSourceAvoid() %>" DataValueField="BoolValue"
> DataTextField="Name">
> </asp:CheckBoxList>
>
> test.aspx.cs:
> ============
> private DataRow getCheckboxRow(DataTable dt, bool isChecked, string name)
> {
> DataRow dr = dt.NewRow();
> dr[0] = isChecked;
> dr[1] = name;
> return dr;
> }
>
> protected ICollection createDataSourceAvoid()
> {
> DataTable dt = new DataTable();
> dt.Columns.Add(new DataColumn("BoolValue", typeof(bool)));
> dt.Columns.Add(new DataColumn("Name", typeof(string)));
> dt.Rows.Add(getCheckboxRow(dt, myObject.Boolean1, "Text for boolean
> 1"));
> dt.Rows.Add(getCheckboxRow(dt, myObject.Boolean2, "Text for boolean
> 2"));
> DataView dv = new DataView(dt);
> return dv;
> }
>
> private void btnUpdate_Click(object sender, System.EventArgs e)
> {
> mCustomer.AvoidBreads = chklAvoid.Items[0].Selected;
> mCustomer.AvoidDairy = chklAvoid.Items[1].Selected;
> }
>
>