Random rnd = new Random();
        int hak = 5;
        int s1, s2, s3;
        private void button1_Click(object sender, EventArgs e)
        {
            if ((hak >= 1) && (hak <= 5))
            {

                s1 = rnd.Next(1, 20);
                s2 = rnd.Next(1, 20);
                s3 = rnd.Next(1, 20);
                hak--;
                textBox1.Text = s1.ToString();
                textBox2.Text = s2.ToString();
                textBox3.Text = s3.ToString();
                LblHak.Text = hak.ToString();
                if ((s1 == s2) && (s1 == s3) && (s2 == s1) && (s2 == s3) && (s3 == s1) && (s3 == s1))
                {
                    MessageBox.Show("Kazandınız");
                }
            }


            else
                MessageBox.Show("5 Hak Doldu");
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            LblHak.Text = hak.ToString();
        }