title: An unhandled exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
body: <p>I'm trying to create a simple windows-explorer like treeview in c#, however I am getting this error at runtime:</p>
  
  <blockquote>
    <p>An unhandled exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll</p>
    
    <p>Additional information: Access to the path 'c:\$Recycle.Bin\S-1-5-18' is denied.</p>
  </blockquote>
  
  <p>The code I'm using is exactly the same as this example by Microsoft from <a href="http://msdn.microsoft.com/en-us/library/ms171645.aspx" rel="nofollow">MS Tree View example</a>.</p>
  
  <p>Why am I getting this error?</p>