Банкова сметка

private void button1_Click(object sender, EventArgs e)
        {


            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
            if (radioButton1.Checked)
            {
                number = r.Next(0, 101);
            }

            if (radioButton2.Checked)
            {
                number = int.Parse(textBox1.Text);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
            int tries = 0;
            int guess=int.Parse(textBox2.Text);
            if(guess<number)
            {
                textBox3. Text = "Надолу";
            }
            else
            {
                textBox3.Text = "Нагоре";
            }
            tries++;
            textBox4.Text = tries.ToString();