public DoctorWindow(DoctorDto doctor) { InitializeComponent(); _doctor = doctor; VisitRequests = new ObservableCollection <VisitRequestDto>(); var context = new InstanceContext(new DoctorHandler(this)); _server = new DoctorServiceClient(context); InitializeRequests(); VisitRequestsListBox.ItemsSource = VisitRequests; _server.LogInDoctor(_doctor); }