Question

I have the code below which looks like it should work. However, the trigger that references the control with the controlID of “gvSearch” is actually a gridview inside a user control page.

How can I access that gridview so that I can use it as a trigger?

Thanks!

<asp:UpdatePanel ID="pnlSearch" ChildrenAsTriggers="true" runat="server" >
      <Triggers>
          <asp:AsyncPostBackTrigger ControlID="btnSearch" />
          <asp:AsyncPostBackTrigger ControlID="gvSearch" />
      </Triggers>
</asp:UpdatePanel>

Thanks!

Outline:

<%@ Page Title="test">
<%@ Register src="test1.ascx" tagname="test1" tagprefix="test1uc" %>
    <UpdatePanel>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="btnSearch" />
            <asp:AsyncPostBackTrigger ControlID="gvSearch" />
        </Triggers>
        <ContentTemplate>
             <test1uc:test1 ID="test1a" runat="server" />
        </ContentTemplate>
    </UpdatePanel>

Answer 1

What event do you want to use as trigger, the SelectedIndexChanged-event? Then apply the appropriate EventName.

<asp:AsyncPostBackTrigger ControlID="gvSearch" EventName="SelectedIndexChanged" />

However, that should already be the default event for GridView (see the remarks section).

Have a look at this thread: http://forums.asp.net/t/1136932.aspx

Update I think the best approach in your situation is to provide a custom event in your UserControl that is bubbled from the SelectedIndexChanged event from the GridView in the UC. Then you can use this event as AsyncPostBackTrigger for your UpdatePanel, e.g.:

<asp:AsyncPostBackTrigger ControlID="test1a" EventName="GridSearchClicked" />