Question

I am using an update panel. There are lots of checkbox in repeater and I want to use an update panel trigger but I can’t access the checkbox control. How can I access it?

<asp:UpdatePanel ID="up" runat="server">
    <ContentTemplate>
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="checkbox1"
            EventName= "CheckedChanged" />
    </Triggers>
</asp:UpdatePanel>

Answer 1

A control that the AsyncPostBackTrigger control references must be in the same naming container as the update panel for which it is a trigger. Triggers that are based on controls in other naming containers are not supported.

You can use ScriptManager.RegisterAsyncPostBackControl instead.