title: How to parse 00:00.00000 to TimeSpan?
body: <p>I try to parse string via c#:</p>
  
  <pre><code>  var tm = TimeSpan.ParseExact(00:00.00000, "hh:mm.sssss", CultureInfo.InvariantCulture);
  </code></pre>
  
  <p>and then get TotalMilliseconds, but i get FormatException.</p>
  
  <p>How to do that?</p>