title: Cannot find JavaScriptSerializer in .Net 4.0
body: <p>I cannot seem to find the <a href="http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx"><code>JavaScriptSerializer</code></a> object nor the the <code>System.Web.Script.Serialization</code> namespace within Visual Studio 2010.  I need to serialize something to JSON what am I supposed to use?</p>
  
  <p>And yes, I already included the <code>System.Web.Extensions</code> (in System.Web.Extensions.dll) within the project.  Which is why I am shocked?</p>
  
  <ul>
  <li>I do know <code>System.Web.Extensions</code> was marked as <a href="http://weblogs.asp.net/jeff/archive/2008/07/09/any-bets-on-whether-or-not-javascriptserializer-will-really-be-obsolete.aspx">obsolete</a> in 3.5</li>
  </ul>