public Dictionary <string, string> GetExtraFeatures(string i_LicensePlateNumber) { Vehicle curVehicle = SearchVehicle(i_LicensePlateNumber); Dictionary <string, string> extraFeatures = null; if (curVehicle == null) { throw new VehicleNotInGarageException(); } else { extraFeatures = curVehicle.GetExtraFeatursDictionary(); } return(extraFeatures); }