title: DbContext "using" in a single line
body: <p>I find myself doing this a lot:</p>
  
  <pre><code>using(var db = new MyDbContext())
  {
    return db.Users.ToList(); // or some other simple query
  }
  </code></pre>
  
  <p>It would be nice to these simple cases as something like:</p>
  
  <pre><code>return MyDbContext.Execute(db =&gt; db.Users);
  </code></pre>
  
  <p>but I'm not sure how I would do the extension method.  Ideally (i think) it would take a DbContext (so I could reuse the code) and return the templated IList.. but is this possible?</p>
  
  <p>Of course, if there's already a method that does this I would love to hear about it.. </p>