title: Visual Studio 2012 how to get missing assembly references
body: <p>I'm new to c# and visual studio.. </p>
  
  <p>currently i'm developing a metro application fro windows 8 that works as a proxy switcher application..</p>
  
  <p>when I using this code </p>
  
  <p><strong>System.Net.GlobalProxySelection.Select = new System.Net.WebProxy(proxyURI);</strong></p>
  
  <p>it says GlobalProxySelection does not exist in the System.Net.... I imported system.net at the begining of the code..</p>
  
  <p><strong>Edit</strong>
  no problem with System.net... no errors showing at there..  But the thing is I cant use "GlobalProxySelection" and "WebProxy" classes..</p>
  
  <p>Also Target framework is locked in application properties.. </p>