public string VehicleInfo() { string modelNameMessage = "Model Name: " + r_ModelName.ToString(); string licenseNumberMessage = "License Number: " + r_LicenseNumber.ToString(); string wheelsListSubjectMessage = "Wheels List: " + PrintAllWheelsInformationByVehicle(); string information = string.Format("{0}\n{1}\n{2}\n{3}\n", modelNameMessage, licenseNumberMessage, m_EngineOfTheVehicle.EngineInformation(), wheelsListSubjectMessage, UniqueVehicleInfo()); return(information); }