<body> <form id="form1" runat="server"> 字串6
<div> <asp:ScriptManager ID="ScriptManager1" runat="server"> 字串5 </asp:ScriptManager> </div> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> 字串5 <ContentTemplate> <div> <asp:Button ID="Button1" runat="server" Text="异步回送" OnClick="Button1_Click"/> 字串7
<asp:Button