Microsoft Visual Basic 2010 Step by Step eBook

Chapter 10 Creating Modules and Procedures 271

To Do This

Call a Function

procedure

Type the function name and any necessary arguments in a program

statement, and assign it to a variable or property of the appropriate

return type. For example:

lblRate.Text = HitRate(Wins, Spins)

Create a public

Sub procedure

Place the procedure statements between the Sub and End Sub keywords

in a module. Sub procedures are public by default. For example:

Sub CostPlusInterest(ByVal Cost As Single, _

ByRef Total As Single)

Cost = Cost * 1.05

Total = Int(Cost)

End Sub

Call a Sub procedure Type the procedure name and any necessary arguments in a program

statement. For example:

CostPlusInterest(Price, TotalPrice)

Pass an argument

by value

Use the ByVal keyword in the procedure declaration. For example:

Sub GreetPerson(ByVal Name As String)

Pass an argument

by reference

Use the ByRef keyword in the procedure declaration. For example:

Sub GreetPerson(ByRef Name As String)