（1） System.Web.UI.ScriptManager.RegisterStartupScript来替代Page.ClientScript.RegisterStartupScript
函数原型：
System.Web.UI.ScriptManager.RegisterStartupScript（Contrl control, Type type,string key,string script, bool addScriptTags）;
参数：
control-----------------要要注册此段javascript语句的控件ID,如下面示例的按钮ID btnUnReport
type--------------------这个参数是注册脚本块控件的类型,即updatepanel的类型。一般直接用this.GetType()即可
key---------------------为要执行的javascirpt语句起的名字，可以随便起，类似控件的name属性
script------------------javascript语句
addScriptTags------为true时，前边的script参数可以不用再写javascript标签；为false,则需自己为script参数添加<script language=’javascript’></script>标签。
注：要多传一个Control参数，如果这个control在UpdatePanel里，则运行脚步，如果这个control不在UpdatePanel则不允许这段脚步。
例如:
System.Web.UI.ScriptManager.RegisterStartupScript(btnTestthis.GetType(), "test", "alert(''test'');window.close();", true);
（2）注册DataItem方法：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="WebForm1.aspx.cs" Inherits="WebForm1" %>
<!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>无标题页</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <script type="text/javascript">
Sys.WebForms.PageRequestManager.getInstance().add_pageLoading( function(sender, e) 
...{ 
... var dataItem = e.get_dataItems()["<%= this.UpdatePanel1.ClientID %>"](); alert(dataItem.Name); 
}); 
</script> <div> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Button ID="test" runat="server" Text="test" OnClick="test_Click" /> </ContentTemplate> </asp:UpdatePanel> </div> </form></body></html>
后台:
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Web.Script.Serialization; public partial class WebForm1 : System.Web.UI.Page ...{ protected void Page_Load(object sender, EventArgs e) ...{ } protected void test_Click(object sender, EventArgs e) ...{ JavaScriptSerializer serializer = new JavaScriptSerializer(); ScriptManager.GetCurrent(this.Page).RegisterDataItem(this.UpdatePanel1, "var _f = function(){alert(''Hello World!'');}; _f;", true); } }
（3）使用Javascript的非模态对话框弹出提示
Page.RegisterStartupScript("alert", "<script language=''javascript''>window.showModelessDialog("javascript:alert(''test'');window.close();","","status:no;resizable:no;help:no;dialogHeight:height:30px;dialogHeight:40px;")</script>");