title: How to convert an MD5 hash to a string and use it as a file name
body: <p>I am taking the MD5 hash of an image file and I want to use the hash as a filename.</p>
  
  <p>How do I convert the hash to a string that is valid filename?</p>
  
  <p>EDIT: <code>toString()</code> just gives "System.Byte[]"</p>