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 WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        DateTime start = new DateTime();
        DateTime stop = new DateTime();
        TimeSpan duration = new TimeSpan();
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            start = DateTime.Now;
            timer1.Enabled = true;
            button1.Enabled = false;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            stop = DateTime.Now;
            duration = stop - start;
            label1.Text = duration.ToString();

            timer1.Enabled = false;
            button1.Enabled = true;
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            textBox1.Text = DateTime.Now.ToString("HH:mm:ss:fff");
        }
    }
}