You should look at overriding the method OnSelectedIndexChanged.
The default implementation just raises the event.

Do you mean the newsgroup? No.

Hi Marc,

The concept of event bubbling means taking unhandled events and shooting
them up the chain of parent controls until they reach the surface. Event
bubbling does not happen magically, it must be order by the controls when
they fire their events. In the case of built-in ASP.NET controls, not all
events order bubbleing to take place. Button, LinkButton, and ImageButton
are those who do event bubbling. They have an event called Command. A
button's Click event does not automatically bubble up, but its Command
event does:

   Protected Overridable Sub OnClick(Byval e as EventArgs)
       RaiseEvent Click(Me, e)
   End Sub
   
   Protected Overridable Sub OnCommand(Byval e as CommandEventArgs)
       RaiseEvent Command(Me, e)
       RaiseBubbleEvent(Me, e)
   End Sub
   
The DropDownList does not do event bubbling by default. You will have to
create your own customized DropDownList to bubble event:

   Public Class MyDropDownList
       Inherits DropDownList

       Protected Overrides Sub OnSelectedIndexChanged(ByVal e As
System.EventArgs)
           MyBase.OnSelectedIndexChanged(e)
           MyBase.RaiseBubbleEvent(Me, New
CommandEventArgs("SelectedIndexChanged", Me))
       End Sub

   End Class

Using this customized DropDownList in your templates content, then you can
handle the ItemCommand event like this:

   Protected Sub t1_ItemCommand(ByVal sender As Object, ByVal e As
System.Web.UI.WebControls.CommandEventArgs) Handles t1.ItemCommand
       If e.CommandName = "SelectedIndexChanged" Then
           Dim ddl As DropDownList = CType(e.CommandArgument, DropDownList)
           Response.Write(ddl.SelectedItem.Value)
       End If
   End Sub

This newsgroup is managed. See
http://msdn.microsoft.com/subscriptions/managednewsgroups/list.aspx for a
complete list of managed newsgroups.

Sincerely,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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