form1.vb

OOP With Microsoft VB.NET And Csharp Step By Step

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        components = New System.ComponentModel.Container()
        Me.Text = "Form1"
    End Sub

#End Region

End Class

NotInheritable Class NotABaseClass
End Class

'Class CantCreateThisClass
'    Inherits NotABaseClass
'End Class


Class BaseClass

    Public Sub BaseMethod()
        Console.WriteLine("BaseMethod in base class.")
    End Sub

End Class

Class DerivedClass
    Inherits BaseClass

    Public Shadows Sub BaseMethod()
        Console.WriteLine("BaseMethod in derived class.")
    End Sub

    Public Shared Sub Main()
        Dim derived As New DerivedClass()
        derived.BaseMethod()

        Dim baseclass As BaseClass = derived
        baseclass.BaseMethod()
    End Sub
End Class