1.加入Timer

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

namespace TestTimer
{
    public partial class Form1 : Form
    {
        int systemCounter = 0; 
        public Form1()
        {
            InitializeComponent(); 
            //设置Timer1控件可用
            this.timer1.Enabled = false;
            //设置Timer1 时间间隔
            this.timer1.Interval = 5000; 
        } 
        //打開服務
        private void openbutton_Click(object sender, EventArgs e)
        {
            systemCounter = 0;
            this.timer1.Start();
        } 
		//关闭线程
        private void stopbutton_Click(object sender, EventArgs e)
        {
            this.timer1.Stop();
        }
		//循环执行的事件
        private void timer1_Tick(object sender, EventArgs e)
        {
            systemCounter += 1; 
            this.textBox1.Text ="現在的數據是"+ systemCounter.ToString().Trim(); 
        }
    }
}