How to set a controlparameter to the value of gridtemplatecolumn dropdownlist??

Question

Hi,

I have a radgrid in which there are 5 columns. one of the column is gridtemplatecolumn in which the itemtemplate is a label and edititemtemplate is dropdownlist. Code is as given below:

<telerik:GridTemplateColumn DataField="GameId" HeaderText="Game Id" SortExpression="GameId" UniqueName="GameId">
                                    <EditItemTemplate>
                                   <telerik:RadComboBox ID="radGameId" runat="server">
                                   <Items>
                                   <telerik:RadComboBoxItem Text="1" Value="1" />
                                   <telerik:RadComboBoxItem Text="2" Value="2" />
                                   </Items>
                                   </telerik:RadComboBox>
                                    </EditItemTemplate>
                                    <ItemTemplate>
                                    <asp:Label ID="ltrlGameId" Text='<%# Eval("GameId") %>' runat="server"></asp:Label>
                                    </ItemTemplate>
                                    </telerik:GridTemplateColumn>

When I am setting the dropdown value as a controlparameter in the sqldatasource, the value is passed as NULL. Not sure why it is happening like this. update parameters(GameId) is as given below:

<UpdateParameters>
                    <asp:Parameter Name="Id" Type="String" />
                    <asp:ControlParameter Name="GameId" Type="Int32" ControlID="radGameId" PropertyName="SelectedValue" />

                    <asp:Parameter Name="IsBase" Type="Boolean" />
                    <asp:Parameter Name="CurrencyPairID" Type="String" />
                    <asp:Parameter Name="InvertFlag" Type="Boolean" />
                </UpdateParameters>

Please let me know how to pass dropdownlist selected value as the parameter to GameId.

Thanks, Mahesh