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Note

The 

System.Diagnostics

namespace provides the 

[Conditional]

attribute, which can be applied to a

class or method. Chapter 16 will explain the role of attributes in detail; however, for now, simply know that if you

use 

[Conditional]

, you are not required to use the related preprocessor symbols.

By default, Visual Studio 2008 always defines a DEBUG symbol; however, this can be prevented by

deselecting the Define DEBUG constant check box option located under the Build tab of your pro-

ject’s Properties page. Assuming you did disable this autogenerated DEBUG symbol, you could now

define this symbol on a file-by-file basis using the #define preprocessor directive:

#define DEBUG

using System;

namespace PreprocessorDirectives

{

class Program

{

static void Main(string[] args)

{