form1.cs

[Visual C# 2005程序设计基础教程] 全部的源码！非常经典

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Samp10_5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            this.label1.Text = this.textBox1.Text;     //随输入的进行显示当前内容
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.textBox1.Copy();  //将textBox1中选择内容拷贝到剪贴板中
            this.textBox2.Paste();  //将剪贴板中内容粘贴到textBox2中

        }
    }
}