StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
hw.AddStyleAttribute("font-size", "10pt");
hw.AddStyleAttribute("font-weight", "none");
hw.AddStyleAttribute("color", "Black");
pnlContents.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
Document pdfDoc = new Document(PageSize.A4, 20f, 10f, 10f, 0f);
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
pdfDoc.Close();
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=Result.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Write(pdfDoc);
Response.End();
this mys codes