title: howto delete rows from DataTable in C# with a filter?
body: <p>i have a DataTable with some rows, one of it is a ID (a string) and a System.DateTime.
  the other rows are not important now.</p>
  
  <p>now i want to delete all the rows with the same ID that have an older DateTime as the newest.</p>
  
  <p>is this possible?</p>
  
  <p>here an example</p>
  
  <ul>
  <li>ID:123 Date:24.12.2010 ...</li>
  <li>ID:123 Date:23.12.2010 ...</li>
  <li>ID:123 Date:22.12.2010 ...</li>
  </ul>
  
  <p>after this i only want:</p>
  
  <ul>
  <li>ID:123 Date:24.12.2010 ...</li>
  </ul>