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copied!<p>You'll be wanting to play with the <code>PageRequestManager</code> from the ASP.NET AJAX library. Here's the MSDN reference for the PRM - <a href="http://msdn.microsoft.com/en-us/library/bb311028.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/bb311028.aspx</a>.</p> <p>Just be for warned Microsoft have stated that the TreeView can be problematic within the UpdatePanel and you'll also want to be <strong>very careful of the performance</strong>, particularly if you have a large TreeView (see my article on optimising the UpdatePanel performance - <a href="http://www.aaron-powell.com/blog.aspx?id=1195" rel="nofollow noreferrer">http://www.aaron-powell.com/blog.aspx?id=1195</a>). You should really look at something like a jQuery plugin (eg: <a href="http://bassistance.de/jquery-plugins/jquery-plugin-treeview/" rel="nofollow noreferrer">http://bassistance.de/jquery-plugins/jquery-plugin-treeview/</a>).</p> <p>But to actually answer you're question you need to:</p> <ul> <li>Have a <code>BeginRequest</code> event handler which will then clear your literal and can even show a Loading (I'm not a fan of the UpdateProgress, I prefer much more granular control I get from doing it myself)</li> <li>Use the <code>EndRequest</code> event to ensure that the Loading component vanises</li> </ul> <p>You could also make the TreeView a <code>AsyncPostbackTrigger</code> of the 2nd UpdatePanel on the page, or just call the Update method on it during the async postback of the TreeView</p>

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