Try THis :
<asp:templatefield headertext="Action" >
<itemtemplate>
<asp:linkbutton id="btnDelete" text="Delete" runat="server" commandname="Delete" onclientclick="<%# "return confirm(\"do you want to delete " + Eval("name") + "\")" %>"> </asp:linkbutton>
</itemtemplate>
</asp:templatefield>
if you to display the name of user or else so you write Eval("name"). here "name" is the field from your db.
if any thing else you want so, please post it.
Mitesh