RT,谢谢！

timer的属性Interval设置为2000，在timer事件中设置一个int count=1
timer事件的方法体为
{
if（count==5）
timer1.Enabled=false
else
///////
count++
}
这就可以了

int count=0;while(count<5){dosomething();count++;Sleep(2000);}

自己写个线程就是了呀

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;
namespace TimerDemo
{
public partial class Form1 : Form
{
int count = 0;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
timer1.Interval = 2000;
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
if (count<5)
{
count++;
//写你要做的事情
}
else
{
timer1.Stop();
}
}
}
}

int count = 1;
private void timer1_Tick(object sender, EventArgs e)
{
if (count <= 5)
{
button1.Text = count.ToString();
if (count == 5)
{
timer1.Stop();
}
}
count++;
}