title: .Net 4.0, New methods in existing classes
body: <p>Is there a blog or MSDN article, which lists all the new methods which are added in .Net 4.0 in existing classes? I could not find any.</p>
  
  <p>Two which I found on blogs till now:</p>
  
  <pre><code>String.IsNullOrWhiteSpace
  Enum.HasFlag
  </code></pre>
  
  <p>Are there more such methods added which anybody found? If yes, please share.</p>