请各位大侠帮个忙，解决一个问题
前台：<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="tt.aspx.cs" Inherits="Oyell.tt" %><%@ Register Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %>
<!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>Untitled Page</title>
<style type="text/css">
#UpdatePanel3 {
border-right: gray 1px solid; border-top: gray 1px solid;
border-left: gray 1px solid; border-bottom: gray 1px solid;
width:200px; height:200px; position: relative;
float: left; margin-left: 10px; margin-top: 10px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" Interval="100" OnTick="Timer1_Tick">
</asp:Timer>
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label><br />
</ContentTemplate>
</asp:UpdatePanel>
<asp:Label ID="Label4" runat="server" Text="Label"></asp:Label>
</form>
</body>
</html>
后台：using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
namespace Oyell
{
public partial class tt : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Label4.Text = "初始化时间：" + DateTime.Now.ToString();
Timer1.Interval = 100;
}
protected void Timer1_Tick(object sender, EventArgs e)
{
Label3.Text = "刷新时间：" + DateTime.Now.ToString();
}
}
}
报错：
<script type="text/javascript">
//<![CDATA[
if (typeof(Sys) === 'undefined') throw new Error('ASP.NET Ajax 客户端框架未能加载。');
//]]>
</script>
asp.net ajax --------------------编程问答-------------------- protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Label4.Text = "初始化时间：" + DateTime.Now.ToString();
Timer1.Interval = 100;
}
} --------------------编程问答-------------------- 楼上说的，我试了，还是不行，一样的错！ --------------------编程问答--------------------
配置文件配置好没? --------------------编程问答-------------------- 楼上说的，我试试 --------------------编程问答-------------------- 能不能给个完整的配置文件，需要都配置那些，非常感谢！我的配置文件是
<?xml version="1.0"?>
<!--
注意: 除了手动编辑此文件以外，您还可以使用
Web 管理工具来配置应用程序的设置。可以使用 Visual Studio 中的
“网站”->“Asp.Net 配置”选项。
设置和注释的完整列表在
machine.config.comments 中，该文件通常位于
\Windows\Microsoft.Net\Framework\v2.x\Config 中
-->
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<appSettings>
<!--画报信息数据库-->
<add key="CONNECTION_STRING" value="Data Source=PC2012072414MXB;User ID=sa;password=JXGAJhzk608.;Initial Catalog=PT_XT;"/>
<add key="CONNECTION_LSWLXT" value="Data Source=PC2012072414MXB;User ID=sa;password=JXGAJhzk608.;Initial Catalog=PT_TZhXX;"/>
<add key="CONNECTION_ASSESS" value="Data Source=PC2012072414MXB;User ID=sa;password=JXGAJhzk608.;Initial Catalog=Assessment;"/>
<!--<add key="CONNECTION_STRINGLANSAN" value="Data Source=218.201.157.138;User ID=sa;password=rzggaj0633;Initial Catalog=lswlxt;"/>-->
<!--<add key="CONNECTION_LSWLXT" value="Data Source=192.168.2.14;User ID=lswlxt;password=lswlxt;Initial Catalog=lswlxt;"/>-->
<!--<add key="CONNECTION_LSWLXT" value="Data Source=.;User ID=sa;password=1908;Initial Catalog=LSWLXT;"/>-->
<!--发布广告时生成的xml文件的存放目录-->
<add key="PageSize" value="16"/>
<!--分页记录数-->
<add key="ResetPasswordSecureHours" value="3"/>
<!--重设密码的有效时间（单位：小时）-->
<add key="CoreProvider" value="Oyell.Core.DAL.SqlDataProvider"/>
<add key="CoreOneProvider" value="Oyell.Core.one.Data.SqlDataProvider"/>
<add key="CoreTwoProvider" value="Oyell.Core.two.Data.SqlDataProvider"/>
<add key="CoreThreeProvider" value="Oyell.Core.three.Data.SqlDataProvider"/>
<add key="CoreCommonProvider" value="Oyell.Core.Data.SqlDataProvider"/>
<add key="CoreLProvider" value="Oyell.Core.Data.LSqlDataProvider"/>
<add key="CoreGLProvider" value="Oyell.Core.Data.GSqlDataProvider"/>
<add key="CoreAProvider" value="Oyell.Core.Data.ASqlDataProvider"/>
<add key="CoreASProvider" value="Oyell.Core.Data.ASSqlDataProvider"/>
<!-- 上传活动链接临时文件夹 -->
<add key="ActionLogoTmpPath" value="/actionPic/pictemp"/>
<add key="ActionLogoPath" value="/actionPic/actionLogo"/>
<add key="ActionLinkTmpPath" value="/actionPic/pictemp"/>
<add key="ActionLinkPath" value="/actionPic/actionlink"/>
</appSettings>
<connectionStrings/>
<system.web>
<!--
设置 compilation debug="true" 将调试符号插入
已编译的页面中。但由于这会
影响性能，因此只在开发过程中将此值
设置为 true。
-->
<!--<customErrors mode="Off"/>-->
<compilation debug="true" defaultLanguage="c#">
<assemblies>
<add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Transactions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.Services, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.DirectoryServices.Protocols, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.EnterpriseServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.ServiceProcess, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Web.RegularExpressions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/></assemblies>
</compilation>
<pages maintainScrollPositionOnPostBack="true" theme="TAdmin" validateRequest="false">
</pages>
<globalization fileEncoding="gb2312" requestEncoding="gb2312" responseEncoding="gb2312"/>
<!--
通过 <authentication> 节可以配置 ASP.NET 使用的
安全身份验证模式，
以标识传入的用户。
-->
<authentication mode="Forms">
<forms loginUrl="Login.aspx" defaultUrl="Default.aspx" name=".CoopenAT" timeout="120" path="/" protection="All">
<credentials passwordFormat="MD5">
<user name="xadmin" password="49F4FAEF4B5297EF4A54579679093F46"/>
<user name="coopen" password="E42462A020C5198291E2F170C5CDB66F"/>
<user name="admin" password="E10ADC3949BA59ABBE56E057F20F883E"/>
</credentials>
</forms>
</authentication>
<machineKey validationKey="AutoGenerate" decryptionKey="AutoGenerate" validation="SHA1"/>
<!--
如果在执行请求的过程中出现未处理的错误，
则通过 <customErrors> 节可以配置相应的处理步骤。具体说来，
开发人员通过该节可以配置
要显示的 html 错误页
以代替错误堆栈跟踪。
<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
<error statusCode="403" redirect="NoAccess.htm" />
<error statusCode="404" redirect="FileNotFound.htm" />
</customErrors>
-->
<httpHandlers>
<add verb="*" path="*.ashx" type="Oyell.Base.Handler.Common"/>
</httpHandlers>
</system.web>
<system.net>
<mailSettings>
<smtp from="qian_qianjin@163.com">
<network host="smtp.163.com" userName="qian_qianjin" password="197812250031"/>
</smtp>
</mailSettings>
</system.net>
</configuration>
补充：.NET技术 , ASP.NET
