PDFsharp & MigraDoc Foundation

Hi,
I am trying to sign an PDF file using PDFSharp v.1.31 (to work on c# Framework 3.5 / 4).

I create a simple project and i can do the "Hello world" sample without problems.

Once i try to use it to sign an pdf file cames the problems, can some one get me on the track?

0 - I read that for older Frameworks i need to use the 1.31, am i wrong?

1 - Does the DPDFSharp 1.31 have the capabilities to sign pdf documents or need other version? (i could not be able to know it.. i already read the versions update and i thing that works!)

2 - the code that i am using, i get 2 different errors:
2.1 - X509Certificate2 could not be found --> (i used the System.Security.Cryptography.X509Certificates;) and it "worked"
2.1 - PdfSignatureField could not be found --> and this one i can not solve!! (what can i do?)
2.2 - PdfSignature could not be found --> (what can i do?)

imports:
using System;
using System.Diagnostics;
using System.IO;
using PdfSharp;
using PdfSharp.Drawing;
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;
using System.Security.Cryptography.X509Certificates;
CODE:
PdfDocument document = PdfReader.Open(inputPdfPath, PdfDocumentOpenMode.Modify);

// Load the certificate
X509Certificate2 certificate = new X509Certificate2(certificatePath, certificatePassword);

// Create a signature field
PdfSignatureField signatureField = new PdfSignatureField(document.Pages[0], "SignatureField");
signatureField.Widget.Rect = new PdfSharp.Pdf.PdfRectangle(50, 50, 150, 80);
document.AcroForm.Fields.Add(signatureField);

// Create the signature
PdfSignature signature = new PdfSignature(signatureField);
signature.Certificate = certificate;
signature.ContactInfo = "Your contact info";
signature.Location = "Location";
signature.Reason = "Reason for signing";
signature.DistinguishedName = certificate.Subject;

// Save the document with the signature
document.Save(outputPdfPath);


I am new using PDFSharp, please thanks for help me!!

No link given. Any version up to 1.51 can be used.

Not "out of the box". Other people implemented signatures.

_________________
Best regards
Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)