TOP: expression(document.body.clientHeight); 

< Div> 

  < ASP: DATAGRID id="Id" runat="server" autogeneratecolumns="False" showheader="True" > 

< HeaderStyle CssClass="GridHeaderScreen"> < /HeaderStyle> 

            < COLUMNS> 

            < ASP:BoundColumn DataField="field" HeaderText="Starting Date" < /ASP:BoundColumn> 

            < ASP:BoundColumn DataField="field" HeaderText="Starting Date" < /ASP:BoundColumn> 

      < /COLUMNS> 

  < /ASP: DATAGRID> 

< /div> 



And in the style sheet we can add the style class

 .GridHeaderScreen

{ 

       

      TOP: expression(document.body.clientHeight); 

      

}