title: References for DBContext, DBSet<> in Entity Framework
body: <p>I am trying to use ADO.Net Codefirst feature of latest Entity Framework 4.0. As part of that I have installed <a href="http://www.microsoft.com/downloads/en/details.aspx?FamilyID=4e094902-aeff-4ee2-a12d-5881d4b0dd3e&amp;displaylang=en" rel="noreferrer">Entity Framework CTP 4</a>  from Microsft and using <a href="http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx" rel="noreferrer">Scott's tutorial</a> to create the model first. Inside the tutorial <code>DBContext</code> and <code>DBSet&lt;&gt;</code> is specified. Could some tell what is the reference to be used in order to access this class.</p>
  
  <p>I have used the following references however nothing happens for <code>DBContext</code> and <code>DBSet&lt;&gt;</code></p>
  
  <ul>
  <li>System.Data.Entity</li>
  <li>System.Data.Entity.Design</li>
  </ul>