【C#学习笔记】保存文件

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

namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        string filename;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog dig = new OpenFileDialog();
            if (dig.ShowDialog()==DialogResult.OK)
                filename = dig.FileName;

        }

        private void button2_Click(object sender, EventArgs e)
        {
            SaveFileDialog dig = new SaveFileDialog();
            if (dig.ShowDialog()==DialogResult.OK)
                File.Copy(filename,dig.FileName);
        }
    }
}