Preprocessing Directives C# Tutorial

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The #define directive defines a character sequence called a symbol.
The existence or nonexistence of a symbol can be determined by #if or #elif
The general form for #define:

#define symbol

#define DEBUGLOG
using System;
class MainClass
{
    public static void Main()
    {
        #if DEBUGLOG
        Console.WriteLine("In Main - Debug Enabled");
        #else
        Console.WriteLine("In Main - No Debug");
        #endif
    }
}
In Main - Debug Enabled