Add and verify the digital signature using ASP.NET and C#

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C#

ASP.NET

PDF

Hi friends! How to generate digital signature in PDF and verify the certificate using private file(.pfx) and public file(.cer) authentication,I am tried too many ways but not clear explanation,if you know share me.
Hopefully SavadaMuthu Saravanan

What I have tried:

String pfxPath = @"..\Demo.pfx";
     PdfCertificate digi = new PdfCertificate(pfxPath, "e-iceblue");
     PdfSignature signature = new PdfSignature(doc, page, digi, "demo");
     signature.ContactInfo = "Harry";
     signature.Certificated = true;
     signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill;