OnRowDeleting Event ?

i need some clarification here,i changed the CommandField for 'Delete" to the template field like this and its working well with the extender .<asp:TemplateField>

<ItemTemplate><asp:LinkButton ID="lnkDelete" runat=server Text="Delete" OnCommand=onCommand_deleter CommandArgument="Deleting" CommandName="Delete" ></asp:LinkButton>

<ajax:ConfirmButtonExtender ID="cnfDelete" TargetControlID="lnkDelete" runat=server ConfirmText="Are you sure you want to delete this ?" ></ajax:ConfirmButtonExtender>

</ItemTemplate>

</asp:TemplateField>

 I am confused b/c

Earlier,i was handling the delete of a gridview row under OnRowDeleting event.Now its being handled by "onCommand_deletePlayer".Then why do I still need to handle onRowDeleting event?It gave me error,when i tried to avoid it.What exactly  i shud code in OnRowDeleting. I am checking something like this rightnow in onRowDeleting,but this doesn't cancel the deletion despite of raising the messageif (gridView.Rows.Count <= 1)

{e.Cancel = true;  lblMessage.Text = "You must keep at least one record    // e.cancel doe NOT work,rows gets deleted despite the message,if delete link is clicked..}

Is there a way to stop the user from deleting the LAST and ONLY row from db for a given condition?thanks