title: Sum of top 5 elements in NHibernate Linq
body: <p>I want to receive sum of property in top 5 elements in linq to NHibernate query. If I use below code:</p>
  
  <pre><code>Session.Query&lt;Document&gt;().Take(5).Sum(x =&gt; x.Value)
  </code></pre>
  
  <p>I get 'method not supported' exception.</p>
  
  <p>Any ideas?</p>
  
  <p>NHibernate 3.3.1.4000</p>