or
GridTableView nestedView1 = (GridTableView)parentItem.ChildItem.NestedTableViews[0]; foreach (GridDataItem childItem1 in nestedView1.Items) { if (childItem1.OwnerTableView.Name == "Products") { string selectedText= childItem1["ProductId"].Text; GridEditableItem NewItem1 = (GridEditableItem)e.Item; TableCell NewProdId = NewItem1["ProductId"]; string NewTxtProdId = (NewProdId.Controls[0] as DropDownList).SelectedValue; string selectedValue=""; //Find a way to get selectedvalue of childItem1 if (selectedValue == NewTxtProdId) { DisplayMessage("This product id is already selected."); e.Canceled = true; } } }

<telerik:RadWindow ID="RadWindowPreindexarCarpeta" runat="server" Modal="True" Behaviors="Close, Move" VisibleStatusbar="False" Width="425px" Height="400px" Title="Editar tipo predefinido" OnClientShow="Garino_Axentria_DMP_Funciones_Indexacion_PreindexarCarpeta.onShow" OnClientClose="Garino_Axentria_DMP_Funciones_Indexacion_PreindexarCarpeta.onClose" EnableViewState="false"> <ContentTemplate> <AxDMP:PreindexarCarpetaTag ID="PreindexarCarpeta" runat="server" /> </ContentTemplate></telerik:RadWindow>Garino_Axentria_DMP_Funciones_Indexacion_PreindexarCarpeta = { show: function (carpetaId) { var activeTooltip = Telerik.Web.UI.RadToolTip.getCurrent(); if (activeTooltip) activeTooltip.hide(); $find(Garino_Axentria_DMP_VerPreindexarCarpetaWindow).show(); $find(Garino_Axentria_DMP_Funciones_Indexacion_PreindexarCarpetaAjaxPanel).ajaxRequest('carpetaId:' + carpetaId); }, close: function () { $find(Garino_Axentria_DMP_VerPreindexarCarpetaWindow).close(); }, refresh: function () { var explorer = $find(Garino_Axentria_DMP_BusquedaPorCarpeta_RadFileExplorerPorCarpeta); if (explorer) { explorer.refresh(); } else { $find(Garino_Axentria_DMP_AjaxManagerId).ajaxRequest(); } }, onShow: function () { }, onClose: function () { Page_IsValid = true; Page_Validators = []; }}//<![CDATA[ function RadMenu1_MouseOver(sender,args) { //Add JavaScript handler code here var id = sender.get_id(); var menu = $(".RadMenu(id$='" + id + "']"); menu.css('z-index', 100); }//]]></script> <script type="text/javascript" id="telerikClientEvents2">//<![CDATA[ function RadMenu1_MouseOut(sender,args) { //Add JavaScript handler code here //Add JavaScript handler code here var id = sender.get_id(); var menu = $(".RadMenu(id$='" + id + "']"); menu.css('z-index', -1); }//]]>