Difference of SignedName and SubjectName in digital signatures

What is the difference between SignedName of a PDFSignature object and SubjectName of a certificate? I have signed a PDF with a digital signature. SignedName is empty and SubjectName contains the name of the certificate holder. Yet there is no function to set the SignedName. How and when is this property filled?

SignedName	The SignedName of the PDF digital signature represent the name provided at signing time (it may signer name or any other)
SubjectName	The SubjectName is represent the certificate (.pfx or store certificate) subject name which is used to sign the PDF document.

Thanks for the clarification. Accessing the SignedName is usually much easier in other libraries (e.g. Java pdfbox) than the SubjectName of a certificate. We are considering replacing Acrobat Reader with a custom tool and encountered the problem that is was empty when using your library. Good to know that your are going to populate this field soon.

It seems that my account is not associated with the provided download.

OK. thanks. Now it works. 

//Creates a new PDF document.  PdfDocument document = new PdfDocument();  //Adds a new page.  PdfPageBase page = document.Pages.Add();  PdfGraphics graphics = page.Graphics;  //Creates a certificate instance from PFX file with private key.  PdfCertificate pdfCert = new PdfCertificate("PDF.pfx", "syncfusion");  //Creates a digital signature.  PdfSignature signature = new PdfSignature(document, page, pdfCert, "Signature");  //Sets an image for signature field.  PdfBitmap signatureImage = new PdfBitmap("signature.png");  //Sets signature information  signature.Bounds = new RectangleF(new PointF(0, 0), signatureImage.PhysicalDimension);  signature.ContactInfo = "johndoe@owned.us";  signature.LocationInfo = "Honolulu, Hawaii";  signature.Reason = "I am author of this document.";  //Sets signed name of signature  signature.SignedName = "Syncfusion Signature";  //Draws the signature image.  graphics.DrawImage(signatureImage, 0, 0);  //Saves and closes the document.  MemoryStream ms = new MemoryStream();  document.Save(ms);  document.Close(true);    // Load an existing PDF document  PdfLoadedDocument ldoc = new PdfLoadedDocument(ms);  // Gets the first signature field  PdfLoadedSignatureField lField = ldoc.Form.Fields[0] as PdfLoadedSignatureField;  // Gets signed name from signature  string signedName = lField.Signature.SignedName;  //Close the PDF document  ldoc.Close(true);  ldoc.Dispose();