title: Convert duration from 0:00 or 00:00 to 00:00:00
body: <p>I'm doing up an application that converts the STRING duration of a media file in C#.
  How do I make it so that the output are as follows:</p>
  
  <p>a. 1:34 (1min 34 sec) to
  00:01:34</p>
  
  <p>b. 0:05 (5 seconds) to
  00:00:05</p>
  
  <p>c. 1:10:05 to 01:10:05</p>
  
  <p>Result will be displayed in a label named lblDuration.</p>
  
  <p>I am using VS2008 C#.</p>
  
  <p>Thanks if you can help.</p>