title: What dlls must i reference to get access to JsonArray in .net framework 4.5
body: <p>I am trying to use the JsonArray class in a new empty asp.net mvc4 project in visual studio 2012 RC. However, I can't seem to get access to the class.</p>
  
  <p>I read in the documentation that the class is defined in the System.Runtime.Serialization.dll in the namespace System.Json. However, when I have added the dll file in my project, and open it in Object Browser, the namespace System.Json is not in there.</p>
  
  <p>Any ideas what could be wrong? Have they relocated the class in the RC?</p>