or
<%@ Master Language="VB" AutoEventWireup="false" CodeBehind="TestTree.master.vb" Inherits="TestTreeViewFiltering.TestTree" %><%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title></title></head><body> <form id="form1" runat="server"> <telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager> <div> <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </div> </form></body></html><%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/TestTree.Master" CodeBehind="TestFilterTree.aspx.vb" Inherits="TestTreeViewFiltering.TestFilterTree" %><%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %><%@ Register Src="~/ucFilterTree.ascx" TagName="ucFilterTree" TagPrefix="uc1" %><asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server"> <telerik:RadSplitter ID="RadSplitter1" runat="server"> <telerik:RadPane ID="rpLeft" runat="server"> <uc1:ucFilterTree ID="ucFilterTreeLeft" runat="server" /> </telerik:RadPane> <telerik:RadSplitBar ID="rsbSplit" runat="server"></telerik:RadSplitBar> <telerik:RadPane ID="rpRight" runat="server"> <uc1:ucFilterTree ID="ucFilterTreeRight" runat="server" /> </telerik:RadPane> </telerik:RadSplitter></asp:Content><%@ Control Language="vb" AutoEventWireup="false" CodeBehind="ucFilterTree.ascx.vb" Inherits="TestTreeViewFiltering.ucFilterTree" %><%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %><asp:UpdatePanel ID="upFilterTree" runat="server"> <ContentTemplate> <telerik:RadTextBox ID="rtbFilterText" runat="server"> <ClientEvents OnLoad="clientLoad" /> </telerik:RadTextBox> <telerik:RadTreeView ID="rtvFilterTree" runat="server"></telerik:RadTreeView> </ContentTemplate></asp:UpdatePanel><telerik:RadScriptBlock ID="RadScriptBlock1" runat="server"> <script type="text/javascript"> String.prototype.startsWith = function (string) { return (this.lastIndexOf(string, 0) === 0); } var _timer = null; function clientLoad(sender) { $telerik.$(".riTextBox", sender.get_element().parentNode).bind("keydown", valueChanging); } function valueChanging(sender, args) { if (_timer) { clearTimeout(_timer); } _timer = setTimeout(function () { var _tree = $find("<%= rtvFilterTree.ClientID%>"); var _textBox = $find("<%= rtbFilterText.ClientID%>"); var _searchString = _textBox.get_element().value; for (var _ii = 0; _ii < _tree.get_nodes().get_count() ; _ii++) { findNodes(_tree.get_nodes().getNode(_ii), _searchString); } }, 100); } function findNodes(node, searchString) { node.set_expanded(true); var _hasChildren = false; for (var _ii = 0; _ii < node.get_nodes().get_count() ; _ii++) { _hasChildren = findNodes(node.get_nodes().getNode(_ii), searchString) || _hasChildren; } var _textToCheck = node.get_textElement().textContent; if (_hasChildren || _textToCheck.toLowerCase().startsWith(searchString.toLowerCase())) { node.set_visible(true); return true; } else { node.set_visible(false); return false; } } </script> </telerik:RadScriptBlock>Public Class ucFilterTree Inherits System.Web.UI.UserControl Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then rtvFilterTree.LoadContentFile("~/TreeData.xml") End If End SubEnd Class<?xml version="1.0" encoding="utf-8" ?><Tree> <Node Text="Desktop" ToolTip="Desktop"> <Node Text="Administrator"> <Node Text="AppData" > <Node Text="Microsoft" /> </Node> <Node Text="Contacts" /> <Node Text="Downloads" /> <Node Text="Documents" /> <Node Text="Favorites" > <Node Text="Links" /> </Node> <Node Text="Music" /> <Node Text="Pictures" /> <Node Text="Saved Games" /> <Node Text="Searches" > <Node Text="History" /> </Node> <Node Text="Videos" /> </Node> <Node Text="Computer" ToolTip="My Computer"> <Node Text="WebServer (\\10.0.0.80) (W:)" /> <Node Text="Local Disk (C:)"> <Node Text="inetpub"> <Node Text="AdminScripts"></Node> </Node> </Node> <Node Text="Local Disk (D:)"> <Node Text="Movies" /> <Node Text="Music" /> <Node Text="Games" /> </Node> </Node> </Node></Tree><telerik:RadEditor ID="red1" runat="server" EnableResize="false" Width="100%" EditModes="Design" AutoResizeHeight="true" EmptyMessage="No notes"><Tools> <telerik:EditorToolGroup> <telerik:EditorTool Name="Print" /> </telerik:EditorToolGroup></Tools></telerik:RadEditor>

[NullReferenceException: Object reference not set to an instance of an object.] dsCloud.UserControls.SpreadSheetSample.get_GridSource() +497 dsCloud.UserControls.SpreadSheetSample.RadGrid1_NeedDataSource(Object source, GridNeedDataSourceEventArgs e) +16 Telerik.Web.UI.RadGrid.OnNeedDataSource(GridNeedDataSourceEventArgs e) +190 Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason) +108 Telerik.Web.UI.RadGrid.OnLoad(EventArgs e) +253 System.Web.UI.Control.LoadRecursive() +70 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Control.LoadRecursive() +189 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3177
<telerik:RadAjaxManagerProxy runat="server"> <AjaxSettings> <telerik:AjaxSetting AjaxControlID="Grid"> <UpdatedControls> <telerik:AjaxUpdatedControl ControlID="Grid" LoadingPanelID="LoadingPanel" /> </UpdatedControls> </telerik:AjaxSetting> </AjaxSettings></telerik:RadAjaxManagerProxy><telerik:RadAjaxLoadingPanel ID="LoadingPanel" runat="server" /><telerik:GridTemplateColumn UniqueName="Column1" SortExpression="Column1"
HeaderStyle-ForeColor="#245E9E" HeaderText="Column 1" ItemStyle-Wrap="true" Resizable="true" AutoPostBackOnFilter="true" CurrentFilterFunction="EqualTo" DataField="Column1" FilterImageUrl="_layouts/Images/CoreSystem.LayoutsApp/filter.png">
<ItemTemplate>
<asp:Label ID="LblColumn1" Text='<%#Eval("Column1")%>' runat="server"></asp:Label>
</ItemTemplate>
<HeaderStyle Width="280px" />
<ItemStyle Font-Names="Arial" Font-Size="11px" Wrap="true" />
</telerik:GridTemplateColumn>