title: Check two List<int>'s for the same numbers
body: <p>I have two List's which I want to check for corresponding numbers.</p>
  
  <p>for example</p>
  
  <pre><code>List&lt;int&gt; a = new List&lt;int&gt;(){1, 2, 3, 4, 5};
  List&lt;int&gt; b = new List&lt;int&gt;() {0, 4, 8, 12};
  </code></pre>
  
  <p>Should give the result 4.
  Is there an easy way to do this without too much looping through the lists?</p>
  
  <p>I'm on 3.0 for the project where I need this so no Linq.</p>