How do I place a signature image into an existing signature field on pdf using itextshrap?

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VB

ASP.NET

PDF

itextsharp

I have a defined field named "Account Holder signature" how can i place this image into that text field, currently i am using absolute position but its not setting it at the correct spot. I want to be able to add it using setfield.

Dim pdfReader As New PdfReader(strPdfTemplate)
Dim pdfStamper As New PdfStamper(pdfReader, New FileStream(strNewPdfFile, FileMode.Create))
Dim path As String

path = Server.MapPath("~\bin\mySig.bmp")
img.Save(path, System.Drawing.Imaging.ImageFormat.Bmp)
Dim sig As AcroFields = pdfStamper.AcroFields
Dim sigposition As AcroFields.FieldPosition = sig.GetFieldPositions("Account Holder Signature")(0)

Dim sigimg As iTextSharp.text.Image
If Not path = String.Empty Then
sigimg = iTextSharp.text.Image.GetInstance(path)
Dim position As iTextSharp.text.Rectangle = sigposition.position

sigimg.SetAbsolutePosition(position.Width, position.Height)
Dim bytContent As PdfContentByte

bytContent = pdfStamper.GetOverContent(1)
bytContent.AddImage(sigimg)

End If
pdfStamper.FormFlattening = True

' close the pdf
pdfStamper.Close()
pdfStamper.Dispose()
pdfReader.Dispose()