title: How to find duplicates in a column in a datatable and make them with a star asp.net vb
body: <p>I have a in-memory <code>DataTable</code> and I need to mark the duplicates ..... for example .. </p>
  
  <p>From
  <img src="https://i.stack.imgur.com/YdP7S.jpg" alt="enter image description here">
  To 
  <img src="https://i.stack.imgur.com/g7fD4.jpg" alt="enter image description here"></p>
  
  <p>I would probably do something like .. </p>
  
  <pre><code>    For each dtrow in dt.rows
      If dtrow("Country") Is one of Duplicates then
              dtrow("Country") += "*"
      end if
      Next
  </code></pre>
  
  <p>Sorry for asking so many questions ... My head is burnt .. nothing came out .. and this project is needing to finish very soon .. </p>