title: How get DirectoryServicesCOMException from InnerException?
body: <p>How I can get DirectoryServicesCOMException ExtendedErrorMessage from InnerException? 
  Programm catch only "catch (Exception e)", so this dont work:</p>
  
  <pre><code>try
  {
     ...
  }
     catch (DirectoryServicesCOMException e)
  {
     throw e;
  }
  </code></pre>
  
  <p><a href="http://s18.postimg.org/728inv9ll/zzz.png" rel="nofollow" title="screen">screen</a></p>
  
  <p>Something like : </p>
  
  <pre><code>try
  {
     ...
  }
     catch (Exception e)
  {
     throw e.InnerException.DirectoryServicesCOMException ....;
  }
  </code></pre>