Using pass by value and pass by reference in VB.NET

In this article We will learn How to use pass by Value and pass by Ref in VB.NET.

Pass by value (using ByVal keyword):- value type is passed by value, a copy of that data is passed. The subroutine/function cannot change the value of this variable back in the calling routine.

For example:

Module Module1

    Class passbyvalue

        Public Shared Sub change(ByVal n As Integer)  ' formal argument

            n = n + 100

        End Sub

        Public Shared Sub main()

            Dim n As Integer = 5

            change(n)                ' actual argument

            Console.WriteLine(n)

        End Sub

    End Class

End Module

OUTPUT:

Pass by Ref (using ByRef keyword): pass ByRef, Visual Basic passes a pointer to the procedure. Any changes the procedure makes to this variable will effect the original .

Module module1

    Class PassByReference

        Public Shared Sub Change(ByRef n As Integer)

            'formal argument

            n = n + 100

        End Sub

        Public Shared Sub Main()

            Dim n As Integer = 5

            Change(n)

            'actual argument

            System.Console.WriteLine(n)

        End Sub

    End Class

End Module

OUTPUT: