title: TimeSpan.TryParseExact not working
body: <p>I'm trying to retrieve a timespan from a string, but TryParseExact is returning false (fail).</p>
  
  <p>I can't see what I'm doing wrong, can you help? I've tried 2 versions of my line in the code, both do not work.</p>
  
  <pre><code>TimeSpan.TryParseExact("04:00:01","HH:mm:ss",CultureInfo.CurrentCulture, out aTime)
  </code></pre>
  
  <p>and</p>
  
  <pre><code>TimeSpan.TryParseExact("04:00:01","HH:mm:ss", null, out aTime)
  </code></pre>
  
  <p>EDIT:
  both responses here are correct, I have the wrong format for my custom timespan format - the mistake I made is to assume that the custom formats for DateTime would work for TimeSpans, but they do not.</p>