title: 'DirectoryServices' does not exist in the namespace 'System'
body: <p>I am trying to use DirectoryEntry in a ASP.Net MVC (C#) project and receive the following error:</p>
  
  <blockquote>
    <p>The type or namespace '<code>DirectoryServices</code>' does not exist in the namespace '<code>System</code>'.</p>
  </blockquote>
  
  <p>I have added the following references to my project:</p>
  
  <pre><code>System
  System.DirectoryServices
  </code></pre>
  
  <p>The System.DirectoryServices is loading:</p>
  
  <pre class="lang-none prettyprint-override"><code>C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5.2\System.DirectoryServices.dll
  </code></pre>
  
  <p>Project Target Framework: .Net Framework 4.5.2</p>
  
  <p>This seems like it would typically be a simple reference issue, but as stated above the reference should be there. Any suggestion?</p>