title: The type or namespace name 'Core' does not exist in the namespace
body: <p>I encounter this kind of error when I debug a project 
  I already have <code>EntityFramework.dll</code>, <code>System.Core.dll</code>, <code>System.Data.Entity</code> but still <code>Core</code> is not referenced. </p>
  
  <p>Can someone help me?</p>
  
  <p>I'm having error in this Line </p>
  
  <pre><code>using System.Data.Entity.Core.Objects;
  </code></pre>
  
  <p>This is the error:</p>
  
  <blockquote>
    <p>The type or namespace name 'Core' does not exist in the namespace 'System.Data.Entity' (are you missing an assembly reference?)    </p>
  </blockquote>