How to Add Header and footer in all pages in existing pdf

Hello All,

Any one can tell me how can add Header and footer as image in existing PDF file.
Even i did that but it is working for two pages only, for first and last page.

My Code is.

 

var header = iTextSharp.text.Image.GetInstance(Path.Combine(HttpRuntime.AppDomainAppPath + "images\\letter-head-top.jpg"));
header.ScalePercent(60f);
header.SetAbsolutePosition(0, 760); // X and Y Accroding to need
var footer = iTextSharp.text.Image.GetInstance(Path.Combine(HttpRuntime.AppDomainAppPath + "images\\letter-head-bottom.jpg"));
footer.ScalePercent(60f);
footer.SetAbsolutePosition(0, 0); // X and Y Accroding to need
FileStream file = new FileStream(pathname, FileMode.Create, System.IO.FileAccess.Write);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
hw.Write(htmlpdf); // htmlpdf = Some HTML code render to create pdf
StringReader sr = new StringReader(sw.ToString());

iTextSharp.text.Document pdfDoc = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 10f, 10f, 100f, 50f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
MemoryStream ms = new MemoryStream();
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, file);
pdfDoc.Open();
pdfDoc.Add(header); //Adding Header
pdfDoc.Add(footer); //Adding Footer
htmlparser.Parse(sr);
pdfDoc.Add(header); //Adding Header
pdfDoc.Add(footer); //Adding Footer
htmlparser.Parse(sr);
pdfDoc.Close();
file.Close();

 Result is good for two pages because i use

 

as you can see this is adding header and footer in first and last page ,

 

Now any one can tell me how can add in other pages as well,or let me provide process to add in existing PDF file.

 

Regards,

Shourya V Sengar