look at this page...
http://msdn.microsoft.com/en-us/library/aa479353.aspxset AutoGenerateColumns="False
"
add your columns like this
<Columns>
<asp:BoundField HeaderText="Last" DataField="LastName" SortExpression="LastName"></
asp:BoundF
ield>
<asp:BoundField HeaderText="First" DataField="FirstName" SortExpression="FirstName"
></asp:Bound
Field>
<asp:BoundField HeaderText="Hire Date" DataField="HireDate" SortExpression="HireDate" DataFormatString="{0:d}"></a
sp:BoundFi
eld>
<asp:TemplateField HeaderText="Seniority">
<ItemTemplate>
<%# ComputeSeniorityLevel(Date
Time.Now (DateTime)Eval("HireDate")
) %>
</ItemTemplate>
</asp:TemplateField>
</Columns>