L enumerazioni, che casino!!!

using System;

namespace Wrox.Prova.Enumerazioni
{
    public enum TimeOfDay
    {
        Morning = 0,
        Afternoon = 1,
        Evening = 2
    }
    class EnumExample
    {
        public static int Main()
        {
            WriteGreeting(TimeOfDay.Morning);
            return 0;
        }
        static void WriteGreeting(TimeOfDay timeOfDay)
        {
            switch (timeOfDay)
            {
                case TimeOfDay.Morning:
                    Console.WriteLine("Good morning!");
                    break;
                case TimeOfDay.Afternoon:
                    Console.WriteLine("Good afternoon!");
                    break;
                case TimeOfDay.Evening:
                    Console.WriteLine("Good evening!");
                    break;
                default:
                    Console.WriteLine("Hello!");
                    break;
            }
        }
    }
}

{
            WriteGreeting(TimeOfDay.Morning);
            return 0;
        }
        static void WriteGreeting(TimeOfDay timeOfDay)
        {

ecc...

}