title: comparing two Lists in C#
body: <p>I have two Lists, and I've values in these as,</p>
  
  <pre><code>List1                  List2
  -----                  -----
   1                      1
   2                      2
                          3
  </code></pre>
  
  <p>I've to compare the second list with the first list, and I've to return the values which is not in the <code>List1</code>(here "3"), how can we compare two lists like this?</p>
  
  <p>can anyone help me?</p>