title: Select rows with null value for a column from datatable
body: <p>Have an issue in selecting rows with a column value as null. I tried many options:</p>
  
  <p>Dim dr() As DataRow = dt.Select("Col1 Is DBNull.Value","")</p>
  
  <p>Dim dr() As DataRow = dt.Select("Col1 Is " &amp; DBNull.Value,"")</p>
  
  <p>None worked for me. Please help me with correct syntax.</p>