title: 'System.IO.Directory' does not contain a definition for 'EnumerateFiles'
body: <p>habe a problem, I developed a program with .NET 4 Framework but I have to switch to 3.5 (VS 2008) - but in 3.5 is EnumerateFiles not included. What I can use for this ? </p>
  
  <p>I use it here:</p>
  
  <pre><code>var txtFiles = Directory.EnumerateFiles(folder_pfad, "*.txt", SearchOption.TopDirectoryOnly);
  </code></pre>
  
  <p>Thanks. </p>