UpdatePanelTest.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UpdatePanelTest.aspx.cs" Inherits="UpdatePanelTest" %>
<%@ Register Assembly="Microsoft.Web.Atlas" Namespace="Microsoft.Web.UI" TagPrefix="Atlas" %>
<!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>UpdatePanelTest</title>
</head>
<body>
    <form />
            </Triggers>
        </atlas:UpdatePanel>
    </div>
    </form>
</body>
</html>

UpdatePanelTest.aspx.cs

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;

public partial class UpdatePanelTest : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        this.Label1.Text = "Selected:"+this.DropDownList1.SelectedValue;
    }
}

鸣谢TerryLee

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