title: Where is EntityConfiguration and ContextBuilder in Visual Studio 2010?
body: <p>I see <a href="http://elegantcode.com/2009/12/15/entity-framework-poco-ef4-a-simple-mapping/" rel="nofollow noreferrer">examples</a> about code-only POCO for en entity framework 4, but I cannot find the classes EntityConfiguration and ContextBuilder and I cannot see which reference I need to add to have them.</p>
  
  <p>Is it part of the .Net Framework 4 or do we have to download something else?</p>