C # error and warning message directives

Precompilation and conditional compilation directives can help us to emit compiled errors or warnings during the execution of the program, the corresponding instructions are #warning and #error, and the following programs show their usage.

Program Listing 8-7:

#define DEBUG
#define RELEASE
#define DEMO version
#if demo version &&! Debug
  #warning are building a demo version
#endif
#if Debug && demo version
  #error you cannot Build a debug demo version
#endif

using System;
Class Demo
{public
  static void Main ()
  {
    Console.WriteLine ("Demo Application");
  }
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In this case, when you try to create a demo version, a warning message appears:

You are building a demo version

An error message is triggered when you try to create a debug demo:

Cannot build a debug demo version