AcornPublishing_essential-csharp-7e/EssentialCSharp-8.0/src/Chapter04/Listing04.57.DefineDirective.cs
#define CSHARP2PLUS

namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter04.Listing04_57
{
    public class Program
    {
        public static void Main()
        {
            // ...
        }
    }
}
