#define TEST
using System;
using System.Diagnostics;

namespace ClassExamples
{
    public class Trace
    {
        [Conditional("TEST")]
        public static void Msg(string msg)
        {
            Console.WriteLine(msg);
        }
    }

    class Test
    {
        static void A() { Trace.Msg("Now in A."); B(); }
        static void B() { Trace.Msg("Now in B."); }

        public static void Main()
        {
            Trace.Msg("Now in Main.");
            A();
            Console.WriteLine("Done.");
            Console.ReadLine();
        }
    }
}