Decimal formatting within Gridview control

Question

I have a gridview control with a item template column as

<asp:TemplateField HeaderText="TOTAL FEE">
<ItemTemplate>
<asp:Label ID="LTFEE" runat="server" Text=""></asp:Label>
</ItemTemplate>
</asp:TemplateField>

on code behind I want to format the column with indian currency with 2 decimal places. I tried this code in RowDataBound event, but it does not format the column.

(e.Row.FindControl("LTFEE") as Label).Text = string.Format("{0:n2}", DataBinder.Eval(e.Row.DataItem, "TFEE").ToString());

What I did wrong, please help me in this regard Thank u