PdfGraphicsAcroFormField.CreateSignature(String, RectangleF) Method
Creates a signature field using the field name and a rectangle where a signature field will be located on a page.
A String that specifies the name of a signature field.
A RectangleF object that represents a rectangle inside which a signature field is located on a page.
A PdfGraphicsAcroFormSignatureField object that represents a created signature field.