title: Is it possible to select items from IEnumerablle by two ids?
body: <p>I have this piece of code that I usually use to update/delete/create items</p>
  <pre><code>HashSet&lt;int&gt; current = new HashSet&lt;int&gt;(diagram.Links.Select(lnk =&gt; lnk.IDInput);
  HashSet&lt;int&gt; received = new HashSet&lt;int&gt;(d.Links.Select(lnk =&gt; lnk.IDInput));
  IEnumerable&lt;int&gt; delete = current.Except(received);
  IEnumerable&lt;int&gt; new = received.Except(current);
  </code></pre>
  <p>And it works perfect when my list works with one ID but it this case I want to do something like  <code>diagram.Links.Select(lnk =&gt; lnk.IDInput AND lnk.IDOutput)</code> Is it even possible or should I use Where instead?</p>
  <p>Thank you in advance</p>