or
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %><%@ 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> <script type="text/javascript" language="javascript"> function keyPress(sender, eventArgs) { var c = eventArgs.get_keyCode(); if ((c < 48) || (c > 57)) { eventArgs.set_cancel(false); } } </script></head><body> <form id="form1" runat="server"> <div> <telerik:RadScriptManager ID="RadScriptManager1" Runat="server"> </telerik:RadScriptManager> <telerik:RadMaskedTextBox ID="RadMaskedTextBox1" Runat="server"> <ClientEvents OnKeyPress="keyPress" /> </telerik:RadMaskedTextBox> </div> </form></body></html>