ASP.NET Page rendered blank after Response.Writefile

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C#

ASP.NET

file

I have this code written to export data to excel in a click event. The export works fine except that the page is rendered blank on this button click.

Can somebody tell me what I am missing in this code..??

protected void btnExportPDF_Click(object sender, EventArgs e)
        {

            if (!string.IsNullOrEmpty(hndPdfpath.Value))
            {
                // This is an important header part that informs the client to download this file.
                Response.AppendHeader("content-disposition", "attachment; filename=" + Path.GetFileName(hndPdfpath.Value));
                FileInfo flnInfo = new FileInfo(hndPdfpath.Value.Trim());
                if (flnInfo.Extension.ToLower() == ".xlsx" || flnInfo.Extension.ToLower() == ".xls")
                {
                    Response.ContentType = "application/Excel";
                }
                else
                {
                    Response.ContentType = "Application/pdf";
                }
                //Write the file directly to the HTTP content output stream.
                Response.WriteFile(hndPdfpath.Value);
            }
        }