private void pictureBox4_Click(object sender, EventArgs e)
        {
            this.Hide();
            StaffNotificationDisplay snd1 = new StaffNotificationDisplay();

            snd1.ShowDialog();
        }
        private void pictureBox4_Click(object sender, EventArgs e)
        {
            var newForm = new StaffNotificationDisplay();

            newForm.Show();
        }