you include the index parameter in the Property statement. 
In this example, the test_number parameter is the index for 
the Scores property.  
 
 
Public Class Student
    ' The private array of scores.
    Private m_Scores(9) As Integer

    ' The indexed Score property procedures.
    Public Property Score(ByVal test_number As Integer) As _
        Integer
        Get
            Return m_Scores(test_number)
        End Get
        Set(ByVal Value As Integer)
            m_Scores(test_number) = Value
        End Set
    End Property
End Class