Why the IEnumerable.Except method doesn't return any elements?
<p>I'm generating two <code>IEnumerable&lt;int&gt;</code> objects:</p>

<pre><code>var listA = model.SelectedFormats.Select(a =&gt; a.ID); //values: 1,2,4
var listB = basket.OrderPosition.Select(x =&gt; x.BookFormatTypeID); //values: 1,4


var result = listA.Except(listB);
</code></pre>

<p>but I can't see any results from the <code>Except</code> method (the compiler doesn't show even that the 
<code>result</code> is)</p>
