Practical Examples of Namespaces in VB.NET 2005 - Inheriting a class from root namespace (or assembly): example continued

(Page 6 of 6 )

From the previous section, we have two classes with the same name "First" (but in different namespaces). Let us create one more class, "Second," as follows:

NamespaceNamespace1
    Public Class Second
        Inherits First
        Private m_c As Integer
        Public Sub New(ByVal x As Integer, ByVal y As Integer,
ByVal z As Integer)
            MyBase.New(x, y)
            m_c = z
        End Sub
        Public Property C() As Integer
            Get
                Return m_c
            End Get
            Set(ByVal value As Integer)
                m_c = value
            End Set
        End Property
        Public Function getSum() As Integer
            Dim s As Integer
            s = Me.A + Me.B + Me.C
            Return s
        End Function
    End Class
EndNamespace

The above section is the trickiest part. The class "Second" gets inherited from the class "First."  Which "First"? Is it related to the root namespace or the namespace "Namespace1"?

First of all, the class "Second" belongs to the namespace "Namespace1." When this class gets inherited from another class, it checks whether that class exists within its own parent scope or not (in this case, it would be "Namespace1"). If it exists, it inherits from the same. This is called scope. So the above class "Second" gets inherited from the class "First" available in the namespace "Namespace1."

If we need to inherit the class "Second" from the class "First" of the root namespace, we may need to modify the code as follows:

NamespaceNamespace1
    Public Class Second
        Inherits SampleInheritance.First
      .
      .
      .
    End Class
EndNamespace

In this article, I simply wanted to explain the topics of OOPS. The sample codes given in this article are neither the best in performance nor the best in programming methodologies.

Any feedback, suggestions, bugs, errors, improvements etc., are highly appreciated at jag_chat@yahoo.com.

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