Microsoft Office® Access 2007 Inside Out

Functions and Subroutines

You can create two types of procedures in Visual Basic—functions and subroutines—also known as Function procedures and Sub procedures. (As you’ll learn later in "Understanding Class Modules“, class modules also support a special type of function, Property Get, and special subroutines, Property Let and Property Set, that let you manage properties of the class.) Each type of procedure can accept parameters—data variables that you pass to the procedure that can determine how the procedure operates. Functions can return a single data value, but subroutines cannot. In addition, you can execute a public function from anywhere in Access, including from expressions in queries and from macros. You can execute a subroutine only ...