or
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <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> <telerik:RadGrid ID="RadGrid1" runat="server"> <MasterTableView> <RowIndicatorColumn> <HeaderStyle Width="20px"></HeaderStyle> </RowIndicatorColumn> <ExpandCollapseColumn> <HeaderStyle Width="20px"></HeaderStyle> </ExpandCollapseColumn> </MasterTableView> </telerik:RadGrid> </div> </form> </body> </html> using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { DataTable dt = new DataTable(); for (int i=1; i<=20; i++) { dt.Columns.Add("Column" + i); } for (int i = 1; i <= 10; i++) { DataRow r = dt.NewRow(); for (int j = 0; j <= 19; j++) { r[j] = "Value"; } dt.Rows.Add(r); } RadGrid1.DataSource = dt; RadGrid1.DataBind(); } } 

Microsoft JScript runtime error: Sys.ArgumentException: Value must not be null for Controls and Behaviors.Parameter name: element