File Download popup overwrites the alert popup
<p>When the user clicks on the "Export to Excel" link, the standard "File download" dialog is presented to the user. <a href="http://i.imgur.com/bsXM9.jpg" rel="nofollow">See here for an example image</a>. </p>

<p>But before exporting the excel file, I want to display an alert popup.  But the Save dialog is obscuring the view of the alert popup. </p>

<p>How can I display the popup without it being obscured? </p>

<p>Here is my code...</p>

<pre><code>dsResult = clsObj.getSearchResults_BL(detObj);

if (OrdDifference != null &amp;&amp; OrdDifference.Any())
{
   ScriptManager.RegisterClientScriptBlock(this.up, this.GetType(), "export", "alert('.....')", true);
   set(dsResult, strName);
}
else
{
  set(dsResult, strName);
}

private void set(DataSet ds, string strFileName)
{
    ExcelEngine excelEngine = new ExcelEngine();
    IApplication application = excelEngine.Excel;
    application.DefaultVersion = ExcelVersion.Excel2007;
    IWorkbook workbook = application.Workbooks.Create(1);
    IWorksheet sheet = workbook.Worksheets[0];
    try
    {
        sheet.Name = strFileName;
        sheet.ImportDataTable(ds.Tables[0], true, 1, 1, -1, -1);

        ...

        workbook.SaveAs(strFileName, ExcelSaveType.SaveAsXLS, HttpContext.Current.Response, ExcelDownloadType.PromptDialog);

    }
    catch (Exception ex)
    {

    }
}
</code></pre>
