;re going to implement the &quot;Where&quot; clause/method/operator. It&#39;s reasonably simple to understand in general, but goes into all of the deferred execution and streaming bits which can cause problems. It&#39;s generic, but only uses one type parameter (which is a big deal, IMO - the more type parameters a method has, the harder I find it to understand in general). Oh, and it&#39;s a starting point for query expressions, which is a bonus.</p>  <h3><strong>What is it?</strong></h3>  <p>&quot;<a href