Asking about using comma separator in grid view

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ASP.NET

plz help me!!!
I want to show amount by using comma separator in asp.net grid gridview.........

like this 12,345,678.87 and my grid view data binding is below........



<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
CellPadding="4" ForeColor="#333333" GridLines="None" DataKeyNames="TheatreClassTypeID"
ShowFooter="True" Width="100%" AllowPaging="True"
onrowcommand="GridView1_RowCommand"
onrowdatabound="GridView1_RowDataBound"
onpageindexchanging="GridView1_PageIndexChanging"
>
<rowstyle backcolor="#F7F6F3" forecolor="#333333">
<columns>
<asp:BoundField DataField="Amount" HeaderText="Amount" SortExpression="Amount" ReadOnly="true">
<HeaderStyle HorizontalAlign="Right" />
<itemstyle horizontalalign="Right">