DevStudent

VB.NET Inheritance

Inheritance is a process of acquiring properties from parent class to child class.
Inherits is the keyword used for inheritance.

VB.NET Inheritance example program

Module Module1
    Public Class class1

        Public Sub print()
            Console.WriteLine("print")
        End Sub

    End Class

    Public Class class2
        Inherits class1

        Public Sub display()
            Console.WriteLine("display")
        End Sub

    End Class

    Sub Main()

        Dim o As New class1()
        o.print()
        Dim c As New class2
        c.print()
        c.display()
        Console.ReadLine()

    End Sub
End Module

Output

print
print
display

Explanation

class1 contain print method
class2 contain display method
class2 inherits class1
print and display methods can be called using object of class2.

VB.NET Multi level Inheritance program

Module Module1
    'create base class
    Public Class class1
        Public i As String = "Hai"
        Public Sub print1()
            Console.WriteLine("I value is " & i)
        End Sub
    End Class
    'create derived class
    Public Class class2
        Inherits class1
        Public Sub print2()
            Console.WriteLine("I value is " & i)
        End Sub
    End Class
    'new derived class
    Public Class class3
        Inherits class2
        Public Sub print3()
            Console.WriteLine("I value is " & i)
        End Sub
    End Class
    Sub Main()
        Dim c1 As New class3()
        c1.print1()
        c1.print2()
        c1.print3()
        Console.ReadLine()
    End Sub

End Module

Output

I value is Hai
I value is Hai
I value is Hai