title: .NET List.Distinct
body: <p>I'm using .NET 3.5. Why am I still be getting:</p>
  
  <blockquote>
    <p>does not contain a definition for 'Distinct'</p>
  </blockquote>
  
  <p>with this code:</p>
  
  <pre><code>using System.Collections.Generic;
  
         //.. . . . . code
  
  
      List&lt;string&gt; Words = new List&lt;string&gt;();
         // many strings added here . . .
      Words = Words.Distinct().ToList();
  </code></pre>