title: Compare two lists to search common items
body: <pre><code>List&lt;int&gt; one //1, 3, 4, 6, 7
  List&lt;int&gt; second //1, 2, 4, 5
  </code></pre>
  
  <p>How to get all elements from one list that are present also in second list?</p>
  
  <p>In this case should be: 1, 4</p>
  
  <p>I talk of course about method without foreach. Rather linq query</p>