custom usercontrol inside of datagrid - loses its state/viewstate on re-bind/postback of the datagrid

[DotNetJunky]

I have a simple usercontrol, a datepicker which contains 3 dropdownlist , it
resides inside a datagrid column and i set the selecteddate property of the
usercontrol from one of the DataBinder.Eval 's ... everythign works fine.
The datepicker also works fine on a regular page, and will normally persist
its viewstate on a page.postback event. However now i am trying to use it in
a datagrid and running into problems.

When the datagrid is re-bound on postback or it's selectedIndexChanged
event, the usercontrol's dropdowns become empty. It isnt saving it's
viewstate and i cant figure out why.

Can someone point me to the right direction of how to persist the state of a
usercontrol's dropdownlists on re-bind of the datagrid? I have tried going
into the usercontrol and removing the if (!Page.IsPostBack) <binding of the
data....> procedure in the OnLoad event, however that solves the empty
dropdowns on postback/re-bind of the datagrid, but the selectedDate property
doesn't get re-set again. So i am still screwed there.

Inside the usercontrol i am viewstating the properties of it, IE, the
selecteddate, selectedday/month/year , etc. Everything is viewstated with a
prefix of this.ID + "_" + propertyvalue.

Thanks in advance,

- DNJ

[recoil@community.nospam]

Your user control should implement INamingContainer which is an
interface that has no methods, therefore implementing it is extremely
easy
MyUserControl: WebControl, INamingContainer


Then make sure that your UserControl is always given the same ID upon
postback and done so in a timely manner.

Follow these 2 steps and your usercontrol should be able to maintain
its viewstate across postbacks

[DotNetJunky]

Well i was already implementing INamingContainer, can't even remember if it
was purposely or not:

public class SimpleDatePicker : System.Web.UI.UserControl,
System.Web.UI.INamingContainer
However, as far as giving it the same ID on postback - I am not dynamically
adding the control to the datagrid, i am actually creating a tag on the page
for the usercontrol and putting it right into the grid in design-time such
as:

<%@ Register TagPrefix="UserControl" TagName="SimpleDatePicker"
Src="usercontrols/SimpleDatePicker.ascx" %>

<UserControl:SimpleDatePicker id="DatePickerExpires" runat="Server"
SelectedDate='<%#DataBinder.Eval(Container.DataIte m, "DATE_EXPIRES") %>'>
</UserControl:SimpleDatePicker>
So would that make a difference? Do i need to dynamically add it on the
datagrid ItemDataBound event or something?

Thanks for your help, you definitely have me started in the right
direction...

- DNJ










"recoil@community.nospam" <marc.derider@gmail.com> wrote in message
news:1111424498.215454.120270@l41g2000cwc.googlegr oups.com...

> Your user control should implement INamingContainer which is an
> interface that has no methods, therefore implementing it is extremely
> easy
> MyUserControl: WebControl, INamingContainer
>
>
> Then make sure that your UserControl is always given the same ID upon
> postback and done so in a timely manner.
>
> Follow these 2 steps and your usercontrol should be able to maintain
> its viewstate across postbacks
>