如何测试文件copy的速度

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前台样式：放两个按钮，测试复制速度

后台代码：

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;
using System.Diagnostics;

namespace Windows文件拷贝
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //File.Copy(@"E:\soft\laomaotao2013.rar", @"G:\images\laomaotao2013.rar", true);
            Stream reader = File.Open(@"E:\soft\laomaotao2013.rar",FileMode.Open,FileAccess.Read);
            Stream writer = File.Open(@"G:\images\laomaotao2013.rar",FileMode.OpenOrCreate,FileAccess.Write);
            Stopwatch watch = new Stopwatch();
            watch.Start();
            reader.CopyTo(writer, 1024);
            watch.Stop();
            reader.Dispose();
            writer.Dispose();
            MessageBox.Show(watch.Elapsed.TotalMilliseconds.ToString());
            //重置计时器
            watch.Reset();

        }

        private void button3_Click(object sender, EventArgs e)
        {
            Stream reader1 = File.Open(@"E:\soft\laomaotao2013.rar", FileMode.Open, FileAccess.Read);
            Stream writer1 = File.Open(@"G:\images\laomaotao2013.rar", FileMode.OpenOrCreate, FileAccess.Write);
            Stopwatch watch = new Stopwatch();
            watch.Start();
            reader1.CopyTo(writer1, 1024 * 10);
            watch.Stop();
            MessageBox.Show(watch.Elapsed.TotalMilliseconds.ToString());
            reader1.Dispose();
            writer1.Dispose();
        }
    }
}

测试效果为每次读1k要比每次读1M速度快