title: Embed QR code in an existing document & read it back programmatically
body: <p>There are several tools available out there to generate &amp; scan QR code. My problem is slightly different.</p>
  
  <p>Is there a way to embed QR code to an existing document? The position can be fixed (say top left corner) and any content there should be pushed down. The documents can be word / excel / pdf etc. Is it also possible to read such a document through a program &amp; extract the QR code?</p>
  
  <p>I am hoping for a .NET/C# answer but open for others as well.  </p>