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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        DateTime timeStop;
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            if (tmrTime.Enabled)
            {
                button1.Text = "&Start";
 
                tmrTime.Stop();
 
            }
            else
            {
                timeStop = DateTime.Now;
 
                button1.Text = "&Stop";
 
                tmrTime.Start();
 
            }
        }
 
        private void tmrTime_Tick(object sender, EventArgs e)
        {
            TimeSpan span = DateTime.Now.Subtract(timeStop);
            label1.Text = span.Minutes.ToString("00") + ":" + _
              span.Seconds.ToString("00") + ":" + span.Milliseconds.ToString( _
              "00");
        }
 
 
    }
}