title: Keep middle datatable column value and delete others
body: <p>I have a <code>DataTable</code> C# that has the following columns:</p>
  <p><a href="https://i.stack.imgur.com/dceUC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dceUC.png" alt="enter image description here" /></a></p>
  <p>I want to keep only one &quot;<strong>Category</strong>&quot; value that is very next to the middle of the total rows by group &quot;<strong>Category</strong>&quot;.</p>
  <p>Here is an example of what I want to accomplish.</p>
  <p><a href="https://i.stack.imgur.com/HS0Ii.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HS0Ii.png" alt="enter image description here" /></a></p>