How to store pdf into one folder using itextsharp in asp.net

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C#

ASP.NET

PDF

itextsharp

I am using following code to create pdf using itextsharp in asp.net. Its working completely fine..

string attachment = "attachment; filename=" + "abc" + ".pdf";
                    Response.ClearContent();
                    Response.AddHeader("content-disposition", attachment);
                    Response.ContentType = "application/pdf";
                    StringWriter s_tw = new StringWriter();
                    HtmlTextWriter h_textw = new HtmlTextWriter(s_tw);
                    h_textw.AddStyleAttribute("font-size", "8pt");
                    h_textw.AddStyleAttribute("color", "Black");
                    divApplicantData.RenderControl(h_textw);
                    Document doc = new Document();
                    doc = new Document(PageSize.A3,5,5,15,5);
                    FontFactory.GetFont("Verdana", 80, iTextSharp.text.BaseColor.RED);
                    PdfWriter.GetInstance(doc, Response.OutputStream);
                    doc.Open();
                    StringReader s_tr = new StringReader(s_tw.ToString());
                    HTMLWorker html_worker = new HTMLWorker(doc);
                    html_worker.Parse(s_tr);
                    doc.Close();
                    Response.Write(doc);
                    Response.End();

How can we give particular folder path so that it will store pdf's to that particular folder.????