title: parse date in mm_dd_yyyy format
body: <p>I need to parse date in the following format.
  mm_dd_yyyy
  I know I can do like this </p>
  
  <pre><code>var dateString = "20050802";
  var date = myDate = DateTime.ParseExact(dateString,
                                      "yyyyMMdd",
                                      System.Globalization.CultureInfo.InvariantCulture);
  </code></pre>
  
  <p>and then replace the -with underscore character. 
  But is there any other way around to do the same?</p>