asp page to pdf report on link button click

protected void writetoPDF()
   {
       MyPage tmpPage = new MyPage();
       HtmlForm form = new HtmlForm();
       form.Controls.Add(form1);
       tmpPage.Controls.Add(form);
       StringWriter sw = new StringWriter();
       HtmlTextWriter htmlWriter = new HtmlTextWriter(sw);
       form.Controls[0].RenderControl(htmlWriter);
       string htmlContent = sw.ToString();
       Document document = new Document();
       // step 2:
       // we create a writer that listens to the document
       // and directs a PDF-stream to a file
       var fileName = HttpContext.Current.ApplicationInstance.Server.MapPath("");
       fileName = fileName + @"\Report.pdf";
       PdfWriter.GetInstance(document, new FileStream(fileName, FileMode.Create));

       // step 3: we open the document
       document.Open();

       // step 4: we add a paragraph to the document
       //document.Add(new Paragraph(htmlContent.ToString()));

       System.Xml.XmlTextReader _xmlr = new System.Xml.XmlTextReader(new StringReader(htmlContent));

       // HtmlParser.Parse(document, _xmlr);
       using (TextReader sReader = new StringReader(htmlContent.ToString()))
       {

           List<IElement> list = HTMLWorker.ParseToList(sReader, new StyleSheet());

           foreach (IElement elm in list)
           {

               document.Add(elm);

           }

       }

       // step 5: we close the document
       document.Close();

       ShowPdf(fileName);
       if (File.Exists(fileName))
           File.Delete(fileName);
   }
   private void ShowPdf(string s)
   {

       string saveas = qms_control_nbr + ".pdf";
       Response.ClearContent();
       Response.ClearHeaders();
       Response.AddHeader("Content-Disposition", "inline;filename=" + saveas);
       Response.ContentType = "application/pdf";
       Response.WriteFile(s);
       Response.Flush();
       Response.Clear();
   }