計時器

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WindowsFormsApplication4

{

    

    public partial class Form1 : Form

    {

        DateTime dtNext;

       

        public Form1()

        {

           

 InitializeComponent();

            

        }

        private void Form1_Load(object sender, EventArgs e)

        {

     

       dtNext = DateTime.Now.AddHours(2);

        

    timer1.Start();

            

        }

        private void timer1_Tick(object sender, EventArgs e)

        {

           

 textBox1.Text = DateTime.Now.ToString();

            

TimeSpan MySpan = dtNext.Subtract(DateTime.Now); 

            

string diffHour = Convert.ToString(MySpan.Hours); 

            

string diffMin = Convert.ToString(MySpan.Minutes); 

            

string diffSec = Convert.ToString(MySpan.Seconds); 

            

label1.Text = "還有" + diffHour + " 時 " + diffMin + " 分 " + diffSec + " 秒 "; 

}

        private void textBox1_TextChanged(object sender, EventArgs e)

        {

            

        }

        private void button1_Click(object sender, EventArgs e)

        {

            

timer1.Enabled = true;

        }

        private void button2_Click(object sender, EventArgs e)

        {

          

  timer1.Enabled = false;

        }

        }