title: UpdateProgress not working with download file
body: <p>The UpdateProgress is not working with download file. Please see below code, in this code I have used updatepabnel and updateprogress.</p>
  
  <p>On btngen click I'm downloading a excel file.file is downloading but UpdateProgress is not showing. If i will not PostBackTrigger then its not downloading the repot and if PostBackTrigger then its not showing updateprogress. pls suggest how to resolve this issue. i do not want to open a separate popup.</p>
  
  <pre><code>&lt;asp:UpdateProgress ID="prgbar"  runat="server" AssociatedUpdatePanelID="pnl1" DynamicLayout="true"&gt;
    &lt;ProgressTemplate&gt;
      &lt;asp:Label id="lblmsg" Text="Please wait while the report generates...." runat="server"&gt;&lt;/asp:Label&gt;
    &lt;/ProgressTemplate&gt;
  &lt;/asp:UpdateProgress&gt;
  
  &lt;asp:UpdatePanel ID="pnl1" ChildrenAsTriggers="False"  runat="server" UpdateMode="Conditional"&gt;
    &lt;ContentTemplate&gt;
      &lt;asp:Button ID="btngen" Text="Generate" runat="server" onclick="btngen_Click" /&gt;
    &lt;/ContentTemplate&gt;
    &lt;Triggers&gt;
      &lt;asp:PostBackTrigger ControlID="btngen"  /&gt;
    &lt;/Triggers&gt; 
  &lt;/asp:UpdatePanel&gt;
  </code></pre>