Digital Signature not display on Acrobat Reader


I am trying to sign digital signature on the PDF file using .NET5 Library version 21.12.0. See the code below… It’s the same code from this link.

public void SignPdf(DigitalSignature signature, string inFile, int pageNumber, string outFile)
using (Document document = new Document(inFile))
using (PdfFileSignature pdfFileSignature = new PdfFileSignature(document))
PKCS7 pkcs = new PKCS7(signature.PFXFile, signature.Password);
pdfFileSignature.Sign(pageNumber, signature.IsVisible, new System.Drawing.Rectangle(100, 60, 250, 25), pkcs);

However, I found that this code work perfectly, if I switched to .NET Framework.

signature.jpg (229.1 KB)

Please suggest me what I should do.


Could you please share your input and problematic output PDF files here for testing? We will investigate the issue and provide you more information on it.