private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.Visible = (false);
            pictureBox2.Visible = (false);
            pictureBox3.Visible = (false);
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            pictureBox1.Visible = (true);
            pictureBox2.Visible = (false);
            pictureBox3.Visible = (false);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            pictureBox1.Visible = (false);
            pictureBox2.Visible = (true);
            pictureBox3.Visible = (false);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            pictureBox1.Visible = (false);
            pictureBox2.Visible = (false);
            pictureBox3.Visible = (true);
        }

        private void button4_Click(object sender, EventArgs e)
        {
            pictureBox1.Visible = (false);
            pictureBox2.Visible = (false);
            pictureBox3.Visible = (false);
        }
    }
}