title: How to add empty datarow at the end of each category
body: <p>I have <code>DataTable</code> in a C# application.</p>
  
  <p>This <code>DataTable</code> has a column named "Category" and has 10 different values.</p>
  
  <p>This is how my DataTable rows looks like:</p>
  
  <p><a href="https://i.stack.imgur.com/lEEeY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lEEeY.png" alt="enter image description here"></a></p>
  
  <p>How can I add a empty row after each Category group, here is an example of what I need:</p>
  
  <p><a href="https://i.stack.imgur.com/RfxWS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RfxWS.png" alt="enter image description here"></a></p>
  
  <p>Any clue?</p>