title: IQueryable<T> does not contain a definition for 'Include' and no extension method 'Include'
body: <p>I'm trying to use Include extension on IQueryable set, but I have the following issue:</p>
  
  <blockquote>
    <p>Error 1   'System.Linq.IQueryable&lt;.Model.InsuranceCaseType>'
    does not contain a definition for 'Include' and no extension method
    'Include' accepting a first argument of type
    'System.Linq.IQueryable&lt;.Model.InsuranceCaseType>' could
    be found (are you missing a using directive or an assembly
    reference?)</p>
  </blockquote>
  
  <p>My code:</p>
  
  <pre><code>var allCaseTypes = Uow.InsuranceCaseType.GetAll().Include(a=&gt;a.Geos);
  </code></pre>
  
  <p>Method <code>GetAll()</code> returns - <code>IQueryable&lt;.Model.InsuranceCaseType&gt;</code></p>
  
  <p>I have in scope the following namespaces:</p>
  
  <pre><code>using System.Collections;
  using System.Collections.Generic;
  using System;
  using System.Data;
  using System.Linq;
  using System.Data.Entity;
  using System.IO;
  using System.Web;
  using System.Web.Mvc;
  </code></pre>