how to change DataFormatString in gridview

hi I use gridview and use coluns on it below is code:

  <asp:GridView runat="server" ID="gvOrders" EmptyDataText="No orderPlaced !" ShowFooter="true" CssClass="gridorder"
        AutoGenerateColumns="false" DataKeyNames="Id">
        <Columns>
            <asp:BoundField DataField="Name" HeaderText="Film Name" />
            <asp:BoundField DataField="Quality" HeaderText="Quality" />
            <asp:BoundField DataField="Price" HeaderText="Price" DataFormatString="{0:C}" />
 </Columns>
    </asp:GridView>

and use DataFormatString="{0:C}" for showing price it will show like:

$100,000.00 I want it show price like 100,000,000 I mean with out $ and with thousand seprator...

Best Regards

Neda