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webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="test5_6.WebForm1" %>
           
   
    
    
        
         
    
    
   

webform1.aspx.cs

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace test5_6{    public partial class WebForm1 : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            Label label1 = new Label();            label1.ID = "label1";            label1.Text = "我是动态追加的标签";            PlaceHolder1.Controls.Add(label1);            TextBox txtInput = new TextBox();            txtInput.ID = "TextBox1";            txtInput.Text = "我是动态追加的文本框";            PlaceHolder1.Controls.Add(txtInput);        }    }}