public void ExecuteNewVehicleCommand(Object obj) { AddVehicleController addVehicleController = new AddVehicleController(); Vehicle vehicle = addVehicleController.AddVehicle(); if (vehicle == null) { return; } var result = socket.AddVehicle(vehicle); if (result == false) { System.Windows.MessageBox.Show("Fehler beim Hinzufügen der Fahrzeuge!"); } parent.restartVehicleCommand(); }