You can #define Other Symbols within a #if Block

Within the body of an #if/#endif pair, you can include #define or #undef directives.  If the body of the #if does contain#define or #undef directives, it must appear before the first token of the containing source file.
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#define DOGSBARK
 
#if DOGSBARK || DOGSGROWL
#define DOGSMAKENOISE
#endif
 
using System;
using DogLibrary;
 
namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            Dog d = new Dog("Kirby", 12);
#if DOGSMAKENOISE
            d.BarkOrGrowl();
#endif
        }
    }
}


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