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VB.NET Language in a Nutshell, Second Edition by Steven Roman PhD, Paul Lomax, Ron Petrusha

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Name

Rem Statement

Syntax

Rem comment
                  ' comment
comment (optional)

A textual comment to place within the code

Description

Use the Rem statement or an apostrophe (') to place remarks within the code.

Rules at a Glance

  • Text or code commented out using either the Rem statement or an apostrophe is not compiled into the final program and, therefore, does not add to the size of the executable.

  • If you use the Rem statement on the same line as program code, a colon is required after the program code and before the Rem statement. For example:

    Set objDoc = MyApp.MyObj : Rem Define the object
                               Rem reference

    This is not necessary when using the much more common apostrophe:

    Set objDoc = MyApp.MyObj   ' Define the object reference
  • Apostrophes held within quotation marks are not treated as comment markers, as this code snippet shows:

    myVar = "'Something'"

Programming Tips and Gotchas

  • The Visual Studio development environment contains block-comment and block-uncomment buttons on the Text Editor toolbar, which allow you to comment out or uncomment a selection of many rows of code at once.

  • You cannot use the line-continuation character (“_”) with comments.

VB.NET/VB 6 Differences

In VB 6, if a line containing a comment ends in an underscore (the line continuation character), the following line is interpreted as a comment as well. In VB.NET, line continuation characters are ignored at the end of a comment line; each comment line must be prefaced with the Rem statement or the ' symbol.

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