Progress Template issue

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C#

Hi Developers,


I'm Using below code, in that Progress popup window is closing before downloading large file.how to rectify that!Please note that i also used in codebehind : "System.Threading.Thread.Sleep(5000);"

<asp:UpdateProgress AssociatedUpdatePanelID="UpdatePanel1" ID="updProgress" runat="server">
        <ProgressTemplate>
            <div id="progressBackgroundFilter">
            </div>
            <div id="processMessage">
                <br />
                <br />
                <img alt="Loading" src="images/UpdateProgress_ModalWait_4.png" /></div>
        </ProgressTemplate>
    </asp:UpdateProgress>