title: Remove duplicate column values from a datatable without using LINQ
body: <p>Consider my datatable,</p>
  
  <pre><code>Id  Name  MobNo
  1   ac    9566643707
  2   bc    9944556612
  3   cc    9566643707
  </code></pre>
  
  <p>How to remove the row <code>3</code> which contains duplicate <code>MobNo</code> column value in c# without using LINQ. I have seen similar questions on SO but all the answers uses LINQ.</p>