public partial class Form1 : Form
    {
        double st, sn, dk;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Text = "00";
            textBox2.Text = "00";
            textBox3.Text = "00";
            textBox4.Text = DateTime.Now.ToShortDateString();
            textBox5.Text = DateTime.Now.ToLongTimeString();
            timer1.Enabled = false;
            timer2.Enabled = false;
            timer3.Enabled = false;
            timer1.Interval = 1000;
            timer2.Interval = 1000;
            timer3.Interval = 1000;
            timer4.Enabled = true;
        }

        private void timer2_Tick(object sender, EventArgs e)
        {
            if (textBox4.Text == DateTime.Now.ToShortDateString() && textBox5.Text == DateTime.Now.ToLongTimeString())
            {
                MessageBox.Show(textBox6.Text);
                timer3.Enabled = true;
            }
        }

        private void timer3_Tick(object sender, EventArgs e)
        {
            Color c;
            c = textBox6.BackColor;
            textBox6.BackColor = textBox6.ForeColor;
            textBox6.ForeColor = c;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            timer2.Enabled = true;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            timer2.Enabled = false;
            timer3.Enabled = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                st = int.Parse(textBox1.Text);
                dk = int.Parse(textBox2.Text);
                sn = int.Parse(textBox3.Text);
                label3.Text = sn.ToString();
                label1.Text = st.ToString();
                label2.Text = dk.ToString();
                timer1.Enabled = true;
            }
            catch
            {
                MessageBox.Show("lütfen adam akıllı saati giriniz");
            }

        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            sn++;
            label3.Text=sn.ToString();
            if (sn == 60)
            {
                dk++;
                sn = 00;
                label2.Text = dk.ToString();
            }
            if (dk == 60)
            {
                st++;
                label1.Text = st.ToString();
                dk = 00;
                label2.Text = dk.ToString();
            }
            if (st == 24)
            {
                st = 00;
                label1.Text = st.ToString();
            }
        }

        private void timer4_Tick(object sender, EventArgs e)
        {
            if (label4.Visible == false)
            {
                label4.Visible = true;
            }
            else
            {
                label4.Visible = false;
            }
            if (label5.Visible == false)
            {
                label5.Visible = true;
            }
            else
            {
                label5.Visible =false;
            }
        }
    }