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Compiler Directive Summary 

Visual Basic language keywords and run-time library members are organized by purpose and use.

Action Language element

Define a compiler constant.

#Const Directive

Compile selected blocks of code.

#If...Then...#Else Directives

Collapse and hide sections of code.

#Region Directive

Indicate a mapping between source lines and text external to the source.

#ExternalSource Directive

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