form1.cs

Visual C#2005程序设计教程

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

namespace LT14_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.Text = "try—finally语句示例";
            label1.Text = "源 文 件";
            label2.Text = "目标文件";
            label3.Text = "";
            button1.Text = "检 查";
            button2.Text = "退 出";
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                File.Copy(textBox1.Text, textBox2.Text);
                label3.Text = "文件复制成功！";
            }
            catch
            { 
                label3 .Text ="出错！";
            }
            finally  // 无论是否发生异常，都正常结束
            {
                MessageBox.Show("感谢使用本软件!","程序结束"); 
            } 

        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}