title: Convert a string into BASE62
body: <p>I'm looking for the c# code to convert a string into BASE62, like this:</p>
  
  <p><a href="http://www.molengo.com/base62/title/base62-encoder-decoder" rel="nofollow noreferrer">http://www.molengo.com/base62/title/base62-encoder-decoder</a></p>
  
  <p>I need those encode and decode-methods for URL-Encoding.</p>