1-) C# - Timer Kullanımı 2 Ornek

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 Timer_Ornekleri

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        int sayac = 0;

        private void button1_Click(object sender, EventArgs e)

        {

            timer1.Start();

        }

        private void timer1_Tick(object sender, EventArgs e)

        {

            sayac++;

            label1.Text = sayac.ToString();

            if (sayac == 2)

            {

                this.BackColor = Color.Red;

            }

            if (sayac == 4)

            {

                this.BackColor = Color.Green;

                sayac = 0;

            }

        }

    }

}