public async void AddAppointment()
 {
     if (LocalCache.Instance.SelectedPatient != null)
     {
         var addedAppointment = new LocalAppointment()
         {
             DateHour   = Date,
             PatientId  = LocalCache.Instance.SelectedPatient.Id,
             WeekNumber = Parent.Parent.WeekNumber,
             Year       = Parent.Parent.Year
         };
         Id = await LocalCache.Instance.ServiceHandler.AddAppointment(addedAppointment);
     }
 }
 public Task <int> AddAppointment(LocalAppointment localAppointment)
 {
     return(serverModel.AddAppointmetAsync(localAppointment));
 }