title: remove all negative integers from a list of integer
body: <p>I need to remove all the negative values from a list of integers.</p>
  
  <pre><code>Dim cells As List(Of Integer) = GridView1.GetSelectedRows().ToList()
  </code></pre>
  
  <p><code>cells</code> returns a list of rows getting from the devexpress grid view. But the filter/group option will return negative integers... How can I either remove those negative values from cells or prevent them from getting in to cells?</p>