How to resolve the issue while exporting to PDF in ASP.NET?

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C#

ASP.NET

I need to resolve the issue while exporting the data from to PDF in asp.net. Here I am using Itextsharp dill. The issue is the PDF is damaged or corrupted message is coming on opening the PDF after exporting is done.Locally it worked fine. But issue is happening in some other machine hosted.

What I have tried:

Please find the complete code:

MISReport objclass = new MISReport();
try
{

    if (validation() == 0)
    {


        DataSet ds = objclass.getPageAccessReport(ViewState["FDOB"].ToString(), ViewState["TDOB"].ToString(), drdRoleName.SelectedValue);
        DataTable dt = new DataTable();
        if (ds.Tables[0].Rows.Count > 0)
        {
            dt = ds.Tables[0];
            grdExport.DataSource = dt;
            grdExport.DataBind();

            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=PageAccesLog_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf");
            //Response.Cache.SetCacheability(HttpCacheability.NoCache);
            StringWriter sw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(sw);
            grdExport.AllowPaging = false;
            grdExport.DataBind();
            grdExport.RenderControl(hw);
            // grdExport.HeaderStyle.Width = "1";
            // grdExport.HeaderRow.Style.Add("font-size", "10px");
            grdExport.Style.Add("text-decoration", "none");
            grdExport.Style.Add("font-family", "Arial, Helvetica, sans-serif;");
            grdExport.Style.Add("font-size", "8px");
            string strHead = strReportHeading + " FROM " + ViewState["FDOB"].ToString() + " TO " + ViewState["TDOB"].ToString();
            StringBuilder strbn = new StringBuilder();
            //string Imagepath = Common.SITE_URL + "logo_barclays.gif";
            strbn.Append("<span style="float: right; text-align: right; font-weight: bold">Date:" + DateTime.Today.ToString("dd-MMM-yyyy") + "</span><div style="text-align: center; font-weight: bold; background-color: White; width: 100%; font-size: 20px; text-decoration: underline"> " + strHead + "</div> <br>");
            strbn.Append(sw.ToString());
            StringReader sr = new StringReader(strbn.ToString());
            Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);
            HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
            PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
            pdfDoc.Open();
            htmlparser.Parse(sr);
            pdfDoc.Close();
            Response.Write(pdfDoc);
            Response.End();
        }
        else
        {
            Common.showMessage("No Records Found", this);
            return;
        }




    }


}
catch (Exception ex)
{

}