public static void Main(string[] args)
        {
            WeatherData weatherData = new WeatherData();

            //create displays and pass them the WeatherData object
            CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay();
            StatisticsDisplay statisticsDisplay = new StatisticsDisplay();
            ForecastDisplay forecastDisplay = new ForecastDisplay();
            HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay();

            var currentDisplayUnsubscriber = weatherData.Subscribe(currentDisplay);
            var statisticsDisplayUnsubscriber = weatherData.Subscribe(statisticsDisplay);
            var forecastDisplayUnsubscriber = weatherData.Subscribe(forecastDisplay);
            var heatIndexDisplayUnsubscriber = weatherData.Subscribe(heatIndexDisplay);

            //simulate weather measurements
            weatherData.setMeasurements(80, 65, 30.4f);
            weatherData.setMeasurements(82, 70, 29.2f);
            weatherData.setMeasurements(78, 90, 30.4f);

            currentDisplayUnsubscriber.Dispose();
            statisticsDisplayUnsubscriber.Dispose();
            forecastDisplayUnsubscriber.Dispose();
            heatIndexDisplayUnsubscriber.Dispose();

            Console.ReadLine();
        }
        public static void Main(string[] args)
        {
            //create the subject to be subscribed to
            WeatherData weatherData = new WeatherData();

            //create displays and pass them the subject
            CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
            StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
            ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
            HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);

            //simulate weather measurements
            weatherData.setMeasurements(80, 65, 30.4f);
            weatherData.setMeasurements(82, 70, 29.2f);
            weatherData.setMeasurements(78, 90, 30.4f);
            Console.ReadLine();
        }