private void GetSelectedHospitalExpertiseDoctors()
 {
     if (listBoxControlHospital.SelectedItem != null && listBoxControlExpertise.SelectedItem != null)
     {
         doctors = bllMember.GetSelectedHospitalExpertiseDoctors((Hospital)listBoxControlHospital.SelectedItem, (DoctorEnumExpertise)listBoxControlExpertise.SelectedItem, member);
     }
     else
     {
         doctors.Clear();
     }
 }