Post-back after file download does not work - download

Question

My page has a pop-up. The button on popup generates and downloads Aspose excel file. (The page also has Ajax settings)
Now after file download, my button is disabled and nothing else works on page unless i refresh it manually.
Popup on page
<div class="modal hide" id="AwaitPracSignoffReportModal">
<div class="modal-header">
<a class="close" data-dismiss="modal">×</a>
<h3>
<asp:Label runat="server" ID="lblPopupHeading" Text="Awaiting Practice Sign-off Report" /></h3>
</div>
<!-- Other asp controls in popup-->
<div class="modal-footer" style="margin-bottom: 5px">
<button class="btn" data-dismiss="modal">
Cancel</button>
<asp:Button runat="server" ID="btnGenerateReport" CssClass="btn btn-primary"
Text="Generate Report" ValidationGroup="ReportModal" OnClientClick="javascript:setFormSubmitToFalse();" />
</div>
</div>
Script
function HideGenerateReportPopup() {
$('#AwaitPracSignoffReportModal').modal().hide();
}
function setFormSubmitToFalse() {
setTimeout(function () { _spFormOnSubmitCalled = false; }, 3000);
return true;
}
CodeBehind
btnGenerateReport.Click += (s, ev) =>
{
this.Presenter.ExportToExcel();
ScriptManager.RegisterStartupScript(this, this.GetType(), "Generate Report", "HideGenerateReportPopup();", true);
};
Presenter Code (different project)
Aspose.Cells.Workbook workbook = new Aspose.Cells.Workbook();
int worksheetNo = 0;
foreach (System.Data.DataTable dt in ds.Tables)
{
Aspose.Cells.Worksheet worksheet = workbook.Worksheets[worksheetNo];
worksheet.Cells.ImportDataTable(dt, true, "A1");
worksheet.AutoFitColumns();
worksheetNo++;
}
workbook.Save(HttpContext.Current.Response, filename, ContentDisposition.Attachment, new XlsSaveOptions(SaveFormat.Excel97To2003));
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
I have added setFormSubmitToFalse function as recommended here.
If I try to add AjaxSettings for the btnGenerateReport, it gives script error
Uncaught Error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
When i remove it, the page stays as is and no more contols work.

Answer 1

Found my answer here
the page and the PDF. You can't do that. Typically download pages start a download as a separate request when you've gone to them (via JavaScript, I believe), with a direct link just in case the JavaScript doesn't work.
Now i have added a separte page (ashx) and open it in a separate tab.