title: How to add System.ComponentModel.Composition.dll in VS2010 IDE?
body: <p>With command line, I use <code>/r:</code> to add reference with VS2010 as follows. </p>
  
  <pre><code>csc Program.cs /r:System.ComponentModel.Composition.dll /r:SharedLibrary.dll
  </code></pre>
  
  <p>How can I add reference in VS2010 IDE?</p>
  
  <p>I tried to right click on the Solution Explorer, then clicked "Add Reference ...", but I can't find the <code>System.ComponentModel.Composition</code>.</p>
  
  <p><img src="https://i.stack.imgur.com/4v4Sy.jpg" alt="enter image description here"></p>