title: CLIPBRD_E_CANT_OPEN error when setting the Clipboard from .NET
body: <p>Why does the following code sometimes causes an Exception with the contents "CLIPBRD_E_CANT_OPEN":</p>
  
  <pre><code>Clipboard.SetText(str);
  </code></pre>
  
  <p>This usually occurs the first time the Clipboard is used in the application and not after that.</p>