title: how to detect unused imports?
body: <p>In my code im often adding some import statements like e.g.:</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Windows;
  using System.Windows.Controls;
  using System.Windows.Data;
  using System.Windows.Documents;
  using System.Windows.Input;
  using System.Windows.Media;
  using System.Windows.Media.Imaging;
  using System.Windows.Shapes;
  using System.Windows.Threading;
  </code></pre>
  
  <p>During development some of these import statements may become unnecessary because i move the code that required these imports. In eclipse, unused imports are marked by the IDE, but in Visual Studio 2010 I couldn't find any hint. How can i detected them?</p>