How to hide column of Gridview when there is no data

 <asp:BoundField DataField="EmpName" HeaderText="Emp.Name">asp:BoundField> 

<asp:BoundField DataField="DOB" HeaderText="DOB">asp:BoundField> 

<asp:BoundField DataField="Qualification" HeaderText="Qualification">

and bind gridview DataSource with "EmpName" and "DOB" column.

So in this case i want to hide "Qualification" column.