
672 Chapter 14 • Upgrading Visual Basic Applications to .NET
Passing Parameters
The default parameter passing mechanism in Visual Basic 6.0 is ByRef.This
means that any change made to the parameter in the called program is reflected
in the calling program. Of course, such passing mechanisms have their pros and
cons. In Visual Basic .NET, on the other hand, the default parameter passing
mechanism is ByVal.When parameters are passed ByVal, any changes made to the
parameter values are effective only in the called function.The original values
present in the calling function are not affected.
When an argument is passed as ByVal, a copy of the variables is ...