Trying to convert a webpage into pdf format

string Pdf = "FullResult(" + DateTime.Now.ToString("ddMMMyyyyhhmmttss") + ").pdf";//Added date to make it unique file name
string PdfPath = Server.MapPath(Pdf);
Document doc = new Document(PageSize.A4, 20, 20, 20, 20);
PdfWriter.GetInstance(doc, new FileStream(PdfPath, FileMode.Create));
string TestName = "Test Name: " ;
doc.Open();
iTextSharp.text.Chunk c2 = new Chunk(GetPData(), FontFactory.GetFont("Arial", 16));// GetPData() is the method to get the information
 Paragraph p = new Paragraph(c2);
Paragraph Test = new Paragraph(TestName, FontFactory.GetFont("Arial", 16));
doc.Add(Chunk.NEWLINE);
doc.Add(p);
doc.Add(new Paragraph("    "));
doc.Add(new Paragraph(Test));
doc.Add(img);
doc.Add(new Paragraph("    "));
doc.Close();

GridView tempGrd = new GridView();
       tempGrd.DataSource = GridView1.DataSource;
       tempGrd.DataBind();

       Response.ContentType = "application/pdf";
       Response.AddHeader("content-disposition","attachment;filename=DataTable.pdf");
       //Response.Cache.SetCacheability(HttpCacheability.NoCache);
       StringWriter sw = new StringWriter();
       HtmlTextWriter hw = new HtmlTextWriter(sw);

       tempGrd.RenderControl(hw);  //We can't use GridView1 directly. This is the way to get the data...
       StringReader sr = new StringReader(sw.ToString());
       Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
       HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
       PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
       pdfDoc.Open();
       htmlparser.Parse(sr);
       pdfDoc.Close();
       Response.Write(pdfDoc);
       Response.End();