RadContextMenu database update

[Nimesh]

I have a radcontextmenu with a radgrid. I attach navigate urls with Querystring values from the Radgrid's datakey values client side. I want to add an additional menuitem that performs a simple database action of update based on the datakey value in the radgrid. I cant find a way of doing this after searching pretty hard, so I need help. Perhaps all I need to do is somehow trigger a server side function, or maybe there is another way. The radgrid uses SQL datasource declarative binding. I would like to do the database update for all the rows selected in the RadGrid based on the datakeynames of each row. So basically, I would like add a menu item that asks "Update Selected Rows?" in an alert, then perform the update for each selected row.

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
            <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="RadGrid1">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="RadGrid1" LoadingPanelID="RadAjaxLoadingPanel1" />
                    </UpdatedControls>
                </telerik:AjaxSetting>
            </AjaxSettings>
        </telerik:RadAjaxManager>
        <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" Width="256px" Height="64px" runat="server">
            <asp:Label ID="Label2" runat="server" ForeColor="Red">Loading... </asp:Label>
        </telerik:RadAjaxLoadingPanel>

        <telerik:RadCodeBlock runat="server" ID="radCodeBlock">
            <script type="text/javascript">
                function showFilterItem() {
                    $find('<%=RadGrid1.ClientID %>').get_masterTableView().showFilterItem();
                }
                function hideFilterItem() {
                    $find('<%=RadGrid1.ClientID %>').get_masterTableView().hideFilterItem();
                }
                function RowContextMenu(sender, eventArgs) {
                    var NavigateUrl;
                    var grid = window["<%= RadGrid1.ClientID %>"];
                    var masterTableView = grid.MasterTableView;
                    var menu = $find("<%=RadContextMenu1.ClientID %>");
                    //document.getElementById("<%= Label1.ClientID %>").innerHTML = eventArgs.getDataKeyValue("ReservationID");
                    NavigateUrl = document.getElementById("<%= Label1.ClientID %>").innerHTML = eventArgs.getDataKeyValue("ReservationID");
                    var evt = eventArgs.get_domEvent();
                    var menuEditItem = menu.findItemByText("Edit");
                    menuEditItem.set_navigateUrl("Reservation.aspx?ReservationID=" + NavigateUrl);
                    menu.show(evt);
                }
                function PopulateParticipant(sender, eventArgs) {
                    var ResID;
                    ResID = eventArgs.getDataKeyValue("ReservationID");
                }
                function OnDateSelected(sender, eventArgs) {
                    sender.set_autoPostBack(true);
                }

            </script>
        </telerik:RadCodeBlock>


    <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
    <telerik:RadGrid ID="RadGrid1" runat="server" PageSize="500" Height="600px" AllowFilteringByColumn="True"
        AllowPaging="True" AllowMultiRowSelection="true" AllowSorting="True" DataSourceID="SqlDsGetRetReservations"
        GridLines="None" ShowGroupPanel="True" Skin="Windows7"
        AutoGenerateColumns="False" EnableLinqExpressions="false">
        <PagerStyle Mode="Slider"></PagerStyle>
        <ClientSettings AllowColumnsReorder="True" AllowDragToGroup="True"
            ReorderColumnsOnClient="True">
            <ClientEvents OnRowContextMenu="RowContextMenu" OnRowSelected="PopulateParticipant" />
            <Scrolling AllowScroll="True" UseStaticHeaders="True" />
            <Selecting AllowRowSelect="true" />
        </ClientSettings>
        <MasterTableView DataSourceID="SqlDsGetRetReservations" NoMasterRecordsText="No Reservations created during this period." PagerStyle-Mode="Advanced" DataKeyNames="ReservationID" ClientDataKeyNames="ReservationID"  AllowFilteringByColumn="true">
            <Columns>
            <telerik:GridButtonColumn ButtonType="LinkButton" CommandName="CancelRes" HeaderText="Cancel" UniqueName="Cancel" Text="Cancel" ItemStyle-Width="35px"></telerik:GridButtonColumn>

                <telerik:GridBoundColumn DataField="ReservationID" FilterControlWidth="50px" ItemStyle-Width="100px" HeaderText="Res ID" SortExpression="ReservationID" UniqueName="ResID">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="DeptID" FilterControlWidth="50px" ItemStyle-Width="100px" HeaderText="DeptID" SortExpression="DeptID" UniqueName="DeptID">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="Chairperson" HeaderText="Chairperson" ItemStyle-Width="150px"  AutoPostBackOnFilter="false" SortExpression="Chairperson" UniqueName="Chairperson">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="Passcode" FilterControlWidth="50px" ItemStyle-Width="100px" HeaderText="Passcode" SortExpression="Passcode" UniqueName="Passcode">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="PasscodeM" FilterControlWidth="50px" ItemStyle-Width="100px" HeaderText="PasscodeM" SortExpression="PasscodeM" UniqueName="PasscodeM">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="ContactName" HeaderText="ContactName" ItemStyle-Width="150px"  SortExpression="ContactName" UniqueName="ContactName">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="StatusID" HeaderText="Status" SortExpression="Status" UniqueName="Status">
                </telerik:GridBoundColumn>
            </Columns>
                    </MasterTableView>
    </telerik:RadGrid>
    <telerik:RadContextMenu ID="RadContextMenu1" runat="server" OnItemClick="RadContextMenu1_ItemClick" Skin="Windows7">
        <Targets>
            <telerik:ContextMenuControlTarget ControlID="RadGrid1" />
        </Targets>
        <Items>
            <telerik:RadMenuItem Text="Add" />
            <telerik:RadMenuItem Text="Edit" />
        </Items>
    </telerik:RadContextMenu>

 Any help would be appreciated.