title: can't add reference to System.xml.linq.dll as it is not built against silverlight runtime
body: <p>I am using System.Xml.Linq</p>
  
  <p>But is unable to add an reference to it, the following error appears whenever I tried adding the reference from Microsoft framework</p>
  
  <p>"can't add reference to System.xml.linq.dll as it is not built against silverlight runtime."</p>
  
  <p>I am using Visual Studio 2010, silverlight 4.0</p>