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Preprocessor directives: Change /define to -define #6246

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Jul 2, 2018
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Preprocessor directives: Change /define to -define #6246

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6 changes: 3 additions & 3 deletions docs/csharp/language-reference/preprocessor-directives/preprocessor-define.md
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---
title: "#define (C# Reference)"
ms.date: 07/20/2015
ms.date: 06/30/2018
f1_keywords:
- "#define"
helpviewer_keywords:
Expand All @@ -23,9 +23,9 @@ You use `#define` to define a symbol. When you use the symbol as the expression

You can define a symbol, but you cannot assign a value to a symbol. The `#define` directive must appear in the file before you use any instructions that aren't also preprocessor directives.

You can also define a symbol with the [/define](../../../csharp/language-reference/compiler-options/define-compiler-option.md) compiler option. You can undefine a symbol with [#undef](../../../csharp/language-reference/preprocessor-directives/preprocessor-undef.md).
You can also define a symbol with the [-define](../../../csharp/language-reference/compiler-options/define-compiler-option.md) compiler option. You can undefine a symbol with [#undef](../../../csharp/language-reference/preprocessor-directives/preprocessor-undef.md).

A symbol that you define with `/define` or with `#define` does not conflict with a variable of the same name. That is, a variable name should not be passed to a preprocessor directive and a symbol can only be evaluated by a preprocessor directive.
A symbol that you define with `-define` or with `#define` does not conflict with a variable of the same name. That is, a variable name should not be passed to a preprocessor directive and a symbol can only be evaluated by a preprocessor directive.

The scope of a symbol that was created by using `#define` is the file in which the symbol was defined.

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6 changes: 3 additions & 3 deletions docs/csharp/language-reference/preprocessor-directives/preprocessor-if.md
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---
title: "#if preprocessor directive (C# Reference)"
ms.date: "02/13/2017"
ms.date: 06/30/2018
f1_keywords:
- "#if"
helpviewer_keywords:
Expand All @@ -27,9 +27,9 @@ A conditional directive beginning with a `#if` directive must explicitly be term

`#define` lets you define a symbol. By then using the symbol as the expression passed to the `#if` directive, the expression evaluates to `true`.

You can also define a symbol with the [/define](../compiler-options/define-compiler-option.md) compiler option. You can undefine a symbol with [#undef](preprocessor-undef.md).
You can also define a symbol with the [-define](../compiler-options/define-compiler-option.md) compiler option. You can undefine a symbol with [#undef](preprocessor-undef.md).

A symbol that you define with `/define` or with `#define` doesn't conflict with a variable of the same name. That is, a variable name should not be passed to a preprocessor directive, and a symbol can only be evaluated by a preprocessor directive.
A symbol that you define with `-define` or with `#define` doesn't conflict with a variable of the same name. That is, a variable name should not be passed to a preprocessor directive, and a symbol can only be evaluated by a preprocessor directive.

The scope of a symbol created with `#define` is the file in which it was defined.

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4 changes: 2 additions & 2 deletions docs/csharp/language-reference/preprocessor-directives/preprocessor-undef.md
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---
title: "#undef (C# Reference)"
ms.date: 07/20/2015
ms.date: 06/30/2018
f1_keywords:
- "#undef"
helpviewer_keywords:
Expand All @@ -10,7 +10,7 @@ ms.assetid: 686c92d2-7194-4be4-b2f4-80091712d513
# #undef (C# Reference)
`#undef` lets you undefine a symbol, such that, by using the symbol as the expression in a [#if](../../../csharp/language-reference/preprocessor-directives/preprocessor-if.md) directive, the expression will evaluate to `false`.

A symbol can be defined either with the [#define](../../../csharp/language-reference/preprocessor-directives/preprocessor-define.md) directive or the [/define](../../../csharp/language-reference/compiler-options/define-compiler-option.md) compiler option. The `#undef` directive must appear in the file before you use any statements that are not also directives.
A symbol can be defined either with the [#define](../../../csharp/language-reference/preprocessor-directives/preprocessor-define.md) directive or the [-define](../../../csharp/language-reference/compiler-options/define-compiler-option.md) compiler option. The `#undef` directive must appear in the file before you use any statements that are not also directives.

## Example

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