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Code Samples - Neevia PDFsign/encrypt

Example 2: Sign a PDF file with an invisible signature - C# Copy 

Add a reference in your Visual Studio project to PDFsignNET assembly.
To do this:
        a. On the Project menu, click Add Reference;
        b. On the .NET tab, locate PDFsignNET and then click Select;
        c. Click OK in the Add References dialog box to accept your selections. 
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   PDFsign.Neevia NVsign = new PDFsign.Neevia();
   int retVal;

   NVsign.CertificateSubject = "Test certificate";
   NVsign.CertificatePassword = "password";

   NVsign.Reason = "I am the creator of this document";

   NVsign.Invisible = true;

   retVal = NVsign.SignPDF(@"c:\in.pdf",@"c:\out.pdf");
   if (retVal != 0) {
     MessageBox.Show("Error code = " + retVal.ToString());
   } else {
     MessageBox.Show("Done");
   }