title: How to implement digital signature in asp.net?
body: <p>I have a asp.net web application.</p>
  
  <p>I want; users can digitally sign PDF documents with certificates installed in the client machine. Users have a PIN. They must upload file and enter their unique PIN. If certificate is installed and true  signed the document and stored at server.</p>
  
  <p>I dont know any plugin for this. I m not sure about my explanation and i hope you have some ideas about that.</p>