static void Main(string[] args)
        {
            Console.WriteLine("Client: Executing the client code with a real Internet:");

            IInternet internet = new RealInternet();

            try
            {
                internet.ConnectTo("craftcode.com");
                internet.ConnectTo("abc.com");
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

            internet = new ProxyInternet(new RealInternet());

            try
            {
                internet.ConnectTo("craftcode.com");
                internet.ConnectTo("abc.com");
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
 public ProxyInternet(RealInternet realInternet)
 {
     _realInternet = realInternet;
 }