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
    {
        int totaltime = 0;
        bool stop = false;
        int sec = 0, min = 0;
        string time = "20:21";
        public Form1()
        {
            
            InitializeComponent();
            
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            if (stop == false)
            {
                sec = totaltime / 60;
                min = totaltime % 60;

                update();
            }

        }
        void update()
        {
            time = "" + min + ":" + sec;
            label1.Text = time;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            totaltime = 0;
            update();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            stop = false;
            update();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            stop = true;
            update();

        }

        
    }
}