' Visual Basic 2008 9.0 .NET Examples - Method Overloading - Object Oriented Programming : 
Class Person
    Private m_Name As String
    Public Property Name() As String
        Get
            Name = m_Name
        End Get
        Set(ByVal value As String)
            m_Name = value
        End Set
    End Property
End Class
Class Persons
    Protected m_Items As Person()
    Default Public ReadOnly Property Item(ByVal index As Integer) As Person
        Get
            Item = m_Items(index)
        End Get
    End Property
    Protected m_Count As Integer
    Public ReadOnly Property Count() As Integer
        Get
            Count = m_Count
        End Get
    End Property
    Public Sub Add(ByVal person As Person)
        ReDim Preserve m_Items(Count)
        m_Items(Count) = person
        m_Count += 1
    End Sub
End Class
Class QueryablePersons : Inherits Persons
    Default Public Overloads ReadOnly Property Item( _
                                               ByVal name As String) As Person
        Get
            Dim index As Integer, found As Boolean
            Do While index < Count AndAlso Not found
                If m_Items(index).Name = name Then
                    Item = m_Items(index)
                    found = True
                Else
                    index += 1
                End If
            Loop
        End Get
    End Property
End Class
Module Client
    Sub Main()
        Dim person1 As Person = New Person
        person1.Name = "John"
        '
        Dim person2 As Person = New Person
        person2.Name = "Jane"
        '
        Dim queryablePersons1 As QueryablePersons = New QueryablePersons
        queryablePersons1.Add(person1)
        queryablePersons1.Add(person2)
        '
        Console.WriteLine(queryablePersons1.Item(1) Is person2)
        Console.WriteLine(queryablePersons1.Item("Jane") Is person2)
        Console.WriteLine(queryablePersons1.Item("Jane").Name = "Jane")
        '
        Console.ReadLine()
    End Sub
End Module
Class Counter
    Protected m_Value As Integer
    Public Function GetValue() As Integer
        GetValue = m_Value
    End Function
    Public Sub Raise()
        m_Value += 1
    End Sub
    Public Sub Lower()
        m_Value -= 1
    End Sub
End Class
Class SpecialCounter : Inherits Counter
    Public Sub SetValue(ByVal value As Integer)
        m_Value = value
    End Sub
    Public Overloads Sub Raise(ByVal stapValue As Integer)
        m_Value += stapValue
    End Sub
    Public Overloads Sub Lower(ByVal stapValue As Integer)
        m_Value -= stapValue
    End Sub
End Class
Module ExerciseSolution
    Sub Main()
        Dim counter1 As Counter = New Counter
        Console.WriteLine(counter1.GetValue() = 0)
        counter1.Raise()
        Console.WriteLine(counter1.GetValue() = 1)
        counter1.Raise()
        Console.WriteLine(counter1.GetValue() = 2)
        counter1.Lower()
        Console.WriteLine(counter1.GetValue() = 1)
        counter1.Lower()
        Console.WriteLine(counter1.GetValue() = 0)
        '
        Dim specialCounter1 As SpecialCounter = New SpecialCounter
        Console.WriteLine(specialCounter1.GetValue() = 0)
        specialCounter1.SetValue(10)
        Console.WriteLine(specialCounter1.GetValue() = 10)
        specialCounter1.Raise()
        Console.WriteLine(specialCounter1.GetValue() = 11)
        specialCounter1.Raise()
        Console.WriteLine(specialCounter1.GetValue() = 12)
        specialCounter1.Lower()
        Console.WriteLine(specialCounter1.GetValue() = 11)
        specialCounter1.Lower()
        Console.WriteLine(specialCounter1.GetValue() = 10)
        specialCounter1.Raise(5)
        Console.WriteLine(specialCounter1.GetValue() = 15)
        specialCounter1.Lower(8)
        Console.WriteLine(specialCounter1.GetValue() = 7)
        '
        Console.ReadLine()
    End Sub
End Module

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