title: How to find difference between 2 time strings in HHMMSSmmmuuu format in C#
body: <p>I have two time strings in <code>HH:MM:SS:mmm:uuu</code> format. How to find the difference (time span) between them?</p>
  
  <pre><code>string t1="06:37:30:210:111";
  string t2="06:38:32:310:222";
  </code></pre>
  
  <p>I want to find the difference (in terms of time) between <code>t2</code> and <code>t1</code> (<code>t2-t1</code>).</p>
  
  <p>How to do this?</p>