Define text to display for 'Null' and also set edit criteria text to 'Is Null'.
Mydb.dbNullText="Any valid null Text" (Def= )
* Null text is also used to create the appropriate sql criteria - Field is Null compare to Field = ''.
Set T.dbNullText="" for forcing SQL criteria to use Is Null in stead of blank.
<script language="VB" runat="server"> Sub Page_Load(Src As Object, E As EventArgs) T.dbGridMagicCell="fi=1| mac=(#Email#|IB||class=blue|#Email#~#Email#|IN|| class=Beige|#Email#)" T.dbBlankText="A blank" T.dbNullText="A null" End Sub </script>
z Class | Tornado Namespace | dbBlankText