Update All Values In Gridview Column

[Motorui]

something like this?::

<ItemTemplate>
                    <asp:DropDownList ID="DropDownList1" runat="server">
                        <asp:ListItem Value="TRUE">YES</asp:ListItem>
                        <asp:ListItem Value="FALSE">NO</asp:ListItem>
                        <asp:ListItem Value="NULL">N/A</asp:ListItem>
                    </asp:DropDownList>