title: How to get array deleted and added items?
body: <p>I have an array like:</p>
  
  <pre><code>var list1 = string[] {"1", "2", "3", "4", "5"};
  </code></pre>
  
  <p>then I change it to :</p>
  
  <pre><code>var list2 = string[] {"1", "2", "3", "4", "6" ,"9"};
  </code></pre>
  
  <p>I try by <code>list1.Except(list2);</code> but this only return different items
  How can I find out which item is deleted and which item is added to array.</p>