public DoctorAppointmentsPage()
        {
            InitializeComponent();
            _patientService = new PatientService();
            _appoitmentService = new AppointmentService();
            List<Appointment> list = _appoitmentService.FindAll();//GetNextAppointmentsByDoctorId(SessionData.UserSessionData.CurrentUserId);

            Dictionary<int, Patient> patientList = GetDictionary(_patientService.FindAll());
            List<object> dataSet = null;
            if (list != null)
            {
                dataSet = new List<object>();
                foreach (Appointment app in list)
                {
                    Patient p = patientList[app.IdPacient];
                    dataSet.Add(new { AppointmentId = app.Id, Patient = p.FirstName + " " + p.LastName, Date = app.ScheduledDate.ToString(), Time = app.Time.ToString(), Symtoms = app.Symptoms.ToString() });
                }

                this._cview = new PagingCollectionView(dataSet, 20);
                this.DataContext = this._cview;
            }
            else
            {
                buttonPrevious.IsEnabled = false;
                buttonNext.IsEnabled = false;
            }
        }