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Response.ContentType = "application/pdf";
 Response.AddHeader("content-disposition", "attachment;filename=Export.pdf");
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 StringWriter sw = new StringWriter();
 HtmlTextWriter hw = new HtmlTextWriter(sw);
 HtmlForm frm = new HtmlForm();
 GrdView.Parent.Controls.Add(frm);
 frm.Attributes["runat"] = "server";
 frm.Controls.Add(GrdView);
 frm.RenderControl(hw);
 StringReader sr = new StringReader(sw.ToString());
 Document pdfDoc = new Document(PageSize.A4, 30f, 30f, 20f, 20f);
 pdfDoc.SetMargins(40f, 40f, 40f, 40f);
 HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
 PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
 pdfDoc.Open();
 htmlparser.Parse(sr);
 pdfDoc.Close();
 Response.Write(pdfDoc);
 Response.End();