private void button3_Click(object sender, EventArgs e)
        {
            MedView mdv = new MedView();

            this.Hide();
            mdv.Show();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            MedView md = new MedView();

            md.Show();
        }
 private void button2_Click(object sender, EventArgs e)
 {
     MedView mv = new MedView();
     mv.Show();
 }
 private void button3_Click(object sender, EventArgs e)
 {
     MedView mdv = new MedView();
     this.Hide();
     mdv.Show();
 }