private void DisplayDoctorInfo(Doctor.Doctor doctor)
 {
     if (doctor == null)
     {
         return;
     }
     doctorContactNumberTxtBox.Text = doctor.doctor_contact_number;
     doctorAddressTxtBox.Text       = doctor.doctor_address;
     doctorSpecialtyTxtBox.Text     = doctor.doctor_specialty;
 }
 private void doctorBox_SelectedValueChanged(object sender, EventArgs e)
 {
     try {
         selectedDoctor = doctorService.GetDoctorById(int.Parse(doctorBox.SelectedValue.ToString()));
         DisplayDoctorInfo(selectedDoctor);
     }
     catch (Exception ex) {
         Console.WriteLine(ex.Message);
         return;
     }
 }
        private void Appointment_Form_Load(object sender, EventArgs e)
        {
            doctorBox.DataSource    = doctorService.GetDoctors();
            doctorBox.DisplayMember = "doctor_name";
            doctorBox.ValueMember   = "doctor_id";

            selectedDoctor = doctorService.GetDoctorById(int.Parse(doctorBox.SelectedValue.ToString()));
            DisplayDoctorInfo(selectedDoctor);

            serviceBox.DataSource    = serviceService.GetServices();
            serviceBox.DisplayMember = "service_category";
            serviceBox.ValueMember   = "service_id";
        }