解决UpdatePanel无刷新，注册客户端脚本不执行问题

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI;
public class ShowMessage
{
/// <summary>
/// 自定义弹出窗口内容
/// </summary>
/// <param name="msg"></param>
public static void AjaxShow(string msg)
{
ScriptManager.RegisterStartupScript((System.Web.UI.Page)HttpContext.Current.CurrentHandler, typeof(System.Web.UI.Page), "ShowMessage", "alert('" + msg + "');", true);
}

/// <summary>
/// 自定义弹出窗口内容并直接转向一个新的页面
/// </summary>
/// <param name="msg"></param>
/// <param name="url"></param>
public static void AjaxShow(string msg, string url)
{
ScriptManager.RegisterStartupScript((System.Web.UI.Page)HttpContext.Current.CurrentHandler, typeof(System.Web.UI.Page), "ShowMessage", "alert('" + msg + "');javascript:location='" + url + "';", true);
}

/// <summary>
/// 自定义弹出窗口内容并选择是直接转向，还是提示转向一个新的页面
/// </summary>
/// <param name="msg"></param>
/// <param name="isreturn"></param>
/// <param name="url"></param>
public static void AjaxShow(string msg, bool isreturn, string url)
{
if (!isreturn)
{
ScriptManager.RegisterStartupScript((System.Web.UI.Page)HttpContext.Current.CurrentHandler, typeof(System.Web.UI.Page), "ShowMessage", "alert('" + msg + "');javascript:location='" + url + "';", true);
}
else
{
ScriptManager.RegisterStartupScript((System.Web.UI.Page)HttpContext.Current.CurrentHandler, typeof(System.Web.UI.Page), "ShowMessage", "if(confirm('" + msg + "')){javascript:location='" + url + "';}", true);
}
}

/// <summary>
/// 自定义弹出窗口内容，自定义是否关闭当前页面
/// </summary>
/// <param name="msg"></param>
/// <param name="close"></param>
public static void AjaxShow(string msg, bool close)
{
if (close)
{
ScriptManager.RegisterStartupScript((System.Web.UI.Page)HttpContext.Current.CurrentHandler, typeof(System.Web.UI.Page), "ShowMessage", "alert('" + msg + "');javascript:window.close();", true);
}
else
{
ScriptManager.RegisterStartupScript((System.Web.UI.Page)HttpContext.Current.CurrentHandler, typeof(System.Web.UI.Page), "ShowMessage", "alert('" + msg + "');", true);
}
}
}

如果出现"ScriptManager"是未知元素在 web.config文件中的system.web节点中加上

 <pages>

      <controls>

        <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

      </controls>

    </pages>

说明文档：http://www.cnblogs.com/kenwong/articles/2773705.html