private int _selectedDoctorID; // Has a default value of 0!!!!

        #endregion Fields

        #region Constructors

        public SampleAddViewModel(PatientViewModel patient)
        {
            this._patient = patient;
            _patientName = patient.Name + " " + patient.Surname;
            this._doctorsVM = new DoctorsViewModel();
            this._allDoctors = _doctorsVM.AllDoctors;
            _labWorker = new LabWorker();
        }
 public ScheduleAppointmentWindowViewModel(CaseViewModel caseVM)
 {
     this._caseViewModel = caseVM;
     this._database = new Database();
     this._doctorsVM = new DoctorsViewModel();
     this._allDoctors = _doctorsVM.AllDoctors;
     _patientName = caseVM.PatientName + " " + caseVM.PatientSurname;
     _receptionist = new Receptionist();
     List<String> appointmentTimes = this.getListOfAppointmentTimes();
     _appointmentTimes = this.createObservableCollectionOfAppointmentTimes(appointmentTimes);
 }