how to access asp.net checkbox control in repeater for update panel trigger?
<p>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?</p>

<pre><code>&lt;asp:UpdatePanel ID="up" runat="server"&gt;
    &lt;ContentTemplate&gt;
    &lt;/ContentTemplate&gt;
    &lt;Triggers&gt;
        &lt;asp:AsyncPostBackTrigger ControlID="checkbox1"
            EventName= "CheckedChanged" /&gt;
    &lt;/Triggers&gt;
&lt;/asp:UpdatePanel&gt;
</code></pre>
