title: Unknown Select(?) of System Data Entity DbSet
body: <p>Is something like this possible?  I am getting the below error.</p>
  
  <pre><code>    db.SomeTable.Add(new SomeTable()
      {
          GuidId = Guid.NewGuid(),
          Name = db.AnotherTable.Select(x =&gt; x.Name.Where(x.Id == localVariable.Id))
      }
  
    );
      db.SaveChanges();
  </code></pre>
  
  <p>Unknown Select(?) of System Data Entity DbSet</p>