private static void TestAddress()
        {
            Address a1 = new Address("123", "Salt Lake", "Utah", 84123);
            Console.WriteLine("a1: ");
            Console.WriteLine(a1);
            Console.WriteLine();

            Address a2 = new Address("456", "Draper", "Utah", 84101) { Apt = "31B" };
            Console.WriteLine("a2: ");
            Console.WriteLine(a2);

            Address a3 = new Address("433", "Park City", "Utah", 84022, "13B");
            Console.WriteLine("a3: ");
            Console.WriteLine(a3);
            #if true
            Console.WriteLine();
            #endif
        }
 public ContactInfo(string email, Address address, Phone phone)
 {
     this.Email = email;
     this.Address = address;
     this.Phone = phone;
 }