I Have Created Signature using PDF Sharp Core But Unable to verify the

I have created the Signature using PDF sharp core and want to verify the Signature using Adobe Acrobat but adobe acrobat not detect my signature. Here is my Code: https://github.com/alirazafalconit/ConsoleApp3.git

 

I also use another Library name "GEMBOX in C#" which attach the Certificate with the PDF and Working But it allow Limited Page(Which is on 2) Available Here Link: https://www.gemboxsoftware.com/pdf/free-version

 

Please Recommend me a Library which works the same like "GEMBOX" but not limited (I want Free library ( Not paid )).

 

Thanks