title: How to add System.Windows dll to Visual Studio 2010 express?
body: <p>I am developing a small application using <em>C#</em> and <em>VS2010</em> as <em>IDE</em> with <em>.NET Framework 4</em>. </p>
  
  <p>I want to use <code>CaptureSource</code> class in order to capture video from laptop's webcam.<br>
  For that i need to add a namespace <code>System.Windows.DependencyObject</code>. </p>
  
  <p>How can I add this? In the <em>Solution Explorer</em>, if I right clicked on <em>Referenced</em>, then <em>.NET</em> tab, I wont be able to see <code>System.Windows</code>. Please see the attached file the same.</p>
  
  <p>Please anyone help me in adding this <em>System.Windows dll</em>.</p>
  
  <p>Thanks in Advance<br>
  Sri</p>