please look at my error on page....

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C#

ASP.NET

Javascript

Ajax

i used UpdateProgress for showing loading image on screen. and i set AsyncPostBackTimeout=100000.

My application taking approx 2 hrs to write all the data in excel file and also doing formation on each sheets.but problem is after 1 hour.It is giving java script error.

"Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 12002"


and also i checked with ValidateRequest="false", Same error has been occurred.

Please help me out this.

<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel2">
                 <ProgressTemplate>
                     <asp:Panel ID="Panel1" CssClass="overlay" runat="server">
                         <asp:Panel ID="Panel2" CssClass="loader" runat="server" Width="250px" Height="100px">
                             <asp:Image ID="ajaxLoadNotificationImage" runat="server" ImageUrl="~/App_Themes/MIELTheme/Images/Loader.jpg"
                                 AlternateText="Processing..." Height="60px" Width="60px" />
                             &nbsp;<b>Please wait.....</b></asp:Panel>
                     </asp:Panel>
                 </ProgressTemplate>
             </asp:UpdateProgress>