Developing Namespaces in VB.NET 2005 - A simple example for a nested namespace

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Up until now, we have examined only the outer level namespaces.  Now, let us work with nested namespaces.  A nested namespace (or sub-namespace) is a namespace which exists within another namespace. They can be nested any number of times.

Let us add one more class file named “Namespace2_third.vb” and modify the code as follows:

NamespaceNamespace1.Namespace2
    Public Class Third
        Inherits Second
        Public Sub New()
            MyBase.New(0, 0, 0)
        End Sub
        Public Sub New(ByVal a As Integer, ByVal b As Integer,
ByVal c As Integer)
            MyBase.New(10, 20, 30)
        End Sub
        Public Function getProduct() As Integer
            Dim s As Integer
            s = Me.A * Me.B * Me.C
            Return s
        End Function
    End Class
EndNamespace

The most important line to understand from the above code is the following line:

NamespaceNamespace1.Namespace2

It shows that we are defining one or more classes for the namespace “Namespace2” which resides in another namespace, “Namespace1.” To access the above class “Third,” I need to modify the code as follows:

PublicClass Form1
    Private Sub Button1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button1.Click
        Dim obj As New Namespace1.Namespace2.Third(10, 20, 30)
        Me.Label1.Text = obj.getProduct
    End Sub
EndClass

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