Forms Data Controls :: How To Export GridView To PDF With Header And Footer By Rtf File

In GridView I am able to export data in pdf by fallowing code in the button click

Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView Gridview1=new GridView ()
GridView1.DataSource=FillGrid(); //Custome function Returns data table
GridView1.DataBind();
GridView1.AllowPaging = false;
GridView1.RenderControl(hw);
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();

but I want to set header and footer of pdf by rtf file.

I have seprate rtf File for header and footer in which we have some image and text I want to show this data as pdf header and footer