Classes in VB.NET

Classes in VB.NET
Classes are types and Objects are instances of the Class. Classes and Objects are very much related to each other. Without objects you can't use a class.

Code:

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Public Class Test

----- Variables
-----Methods
-----Properties
-----Events

End Class

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Code:

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Imports System.Console

Sub Main()
Dim obj As New Test()
'creating a object obj for Test class
obj.disp()
'calling the disp method using obj
Read()
End Sub

End Module

Public Class Test
'creating a class named Test
Sub disp()
'a method named disp in the class
Write("Welcome to OOP")
End Sub
End Class

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Simple Inheritance

Code:

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Public Class Tester
    Public Shared Sub Main
        Dim objJohn As New John
        objJohn.Walk()
    End Sub
End Class


Public Class Person
    Public Sub Walk()
        Console.WriteLine("Walking...")
    End Sub
End Class

Class John
    Inherits Person
End Class

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Call base method

Code:

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Option Strict On

Public Class BaseClass
  Public Sub MainMethod()
      Console.WriteLine("Calling Me.Method1...")
      Me.Method1()
      Console.WriteLine("Calling MyClass.Method1...")
      MyClass.Method1()
  End Sub

  Public Overridable Sub Method1()
      Console.WriteLine("BaseClass.Method1...")
  End Sub
End Class

Public Class DerivedClass : Inherits BaseClass
      Public Overrides Sub Method1()
        Console.WriteLine("DerivedClass.Method1...")
      End Sub
End Class

Public Module modMain
  Public Sub Main()
      Console.WriteLine("Invoking BaseClass.MainMethod")
      Dim bc As New BaseClass
      bc.MainMethod()
      Console.WriteLine()
      Console.WriteLine("Invoking DerivedClass.MainMethod")
      Dim dc As New DerivedClass
      dc.MainMethod()
  End Sub
End Module

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