private void buttonAppointments_Click(object sender, EventArgs e)
        {
            DoctorsAppointmentUserControl doctorsAppointmentUserControl = new DoctorsAppointmentUserControl();

            ControlClass.ShowControl(doctorsAppointmentUserControl, Content);
        }
        private void buttonPATDisplay_Click(object sender, EventArgs e)
        {
            DoctorsAppointmentUserControl doctorsAppointmentUserControl = new DoctorsAppointmentUserControl();

            doctorsAppointmentUserControl.Show();
        }