In FormTemplate I place combobox that select value from LinqDataSource, I want to find Selected Row’s Key value inside Linq’s selecting event at server side that will fire when user click on Add/Edit row in grid.

My code is.

<asp:LinqDataSource ID="linq_Students" runat="server"  

ContextTypeName="dbLibrary.StudentDataContext"

TableName="tbl_Students" OnSelecting="linq_Student_Selecting">            

</asp:LinqDataSource>

<telerik:RadGrid ID="gv_Student" runat="server"...

<MasterTableView...

<Columns>

...

</Columns>

<EditFormSettings...

      <FormTemplate>

<telerik:RadComboBox ID="list_Students" runat="server" SelectedValue='<%# Bind("StudentID") %>' DataSourceID="linq_Students"

DataTextField="StudentName" DataValueField="StudentId">

</telerik:RadComboBox>

...

protected void linq_Student_Selecting (object sender, LinqDataSourceSelectEventArgs e)

{

      Here I want to find Key Value.

}

With ASP Grid we can obtain the same behaviour using following technique.

<asp:LinqDataSource ID="linq_Students" runat="server"  

ContextTypeName="dbLibrary.StudentDataContext"

TableName="tbl_Students" OnSelecting="linq_Student_Selecting">

<SelectParameters>

            <asp:ControlParameter ControlID="ASPGridName" DefaultValue="0"

                  Name="StudentID" PropertyName="SelectedValue" 

Type="Int32"/>

       </SelectParameters>

</asp:LinqDataSource>

protected void linq_ContactPersons_Selecting(object sender, LinqDataSourceSelectEventArgs e)

{

Console.WriteLine(e.SelectParameters.ElementAt(0).Value);

}

What this does is keeps the popup open, which works great.  However, all of the values are lost, and the user has to re-enter all of the values.

How do I retain the values in the popup in this case?

Thanks!