title: Type or namespace of 'ModelBuilder' cannot be found (are you missing a using directive or assembly reference?)
body: <p>In <a href="http://www.asp.net/mvc/tutorials/getting-started-with-mvc3-part7-cs" rel="noreferrer">step 7 of the ASP.MVC 3 Tutorial</a>, it introduces the 'ModelBuilder' type. I'm using ASP.Net 4, MVC 3, and EF 4.1, and I get the red squiggly lines under the 'ModelBuilder' type. It can't find the type. Has that type name changed? What reference should I add to use it?</p>
  
  <pre><code>using System;
  using System.Data.Entity;
  using System.Data.Entity.ModelConfiguration;
  ...
  
      protected override void OnModelCreating(ModelBuilder modelBuilder)
      {
          modelBuilder.Entity&lt;Movie&gt;().Property(p =&gt; p.Price).HasPrecision(18, 2);
      }
  </code></pre>