Postback after files uploaded by AjaxFileUpload

     <ajaxToolkit:AjaxFileUpload runat="server" ID="AjaxFileUpload1"
          OnClientUploadComplete="AjaxFileUpload1_OnClientUploadComplete" />

     <asp:UpdatePanel runat="server" UpdateMode="Conditional" >
          <ContentTemplate>
               <asp:Button runat="server" ID="hiddenButton" style="display:none;" />
               <h2>Panel updated at: <%= DateTime.Now.ToLongTimeString() %></h2>
          </ContentTemplate>
     </asp:UpdatePanel>

     <script type="text/javascript">
          function AjaxFileUpload1_OnClientUploadComplete(sender, args) {
               <%= Page.ClientScript.GetPostBackEventReference(hiddenButton, "") %>;
          }
     </script>