title: Is there a free Diff tool reference I can use in my application?
body: <p>I need to compare the difference between two Strings and show the difference.<br>
  Like the notepad++ compare plugin.</p>
  
  <p>I checked out the <a href="http://code.google.com/p/google-diff-match-patch/" rel="nofollow">http://code.google.com/p/google-diff-match-patch/</a></p>
  
  <p>and it was exactly what I needed, but its copyrighted and may not be used.</p>
  
  <p>I'm developing in C#</p>