how to handle UpdatePanel before async result comes
<p>Ok, i renew my question.
Can I use UpdatePanel to handle this way.
You know, everything in the ContentTemplate, will be async, but how we handle the reuslt before the result comes.
like </p>

<pre><code>&lt;asp:UpdatePanel&gt;
    &lt;ContentTemplate&gt;
        &lt;asp:Button ID="Button1" runat="server" Text="Button" /&gt;&lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt;
&lt;asp:Label ID="info" runat="server" /&gt;
    &lt;/ContentTemplate&gt;
&lt;/asp:UpdatePanel&gt;
</code></pre>

<p>when we click the button, it will query the database in back-end, which need some time, maybe serveral seconds, maybe longer. now how can i make the info label to display "querying", indicate the processing in back-end, the visitor should be wait for somewhile.</p>
