title: How to filter datatable
body: <p>How can i filter a datatable as follows ?</p>
  
  <p>I have two datatable as [cancelledOrders] and [allOrders] n my vb.net form both of the has got a column name [OrderNo]. </p>
  
  <p>What i want to do is filter [allOrders] data table where [OrderNo] column doesn't contain any value equal to values in [OrderNo] column of [cancelledOrders]. </p>
  
  <p>I tried to use List of String. But I wasn't successful. Could someone help me please. </p>
  
  <p>Thanks</p>