How to define behaviour of Parent Class?

Hi Experts,

Here is an outline of my code:

Public Class clsLicence

    Public Property strProgramNameAndMajorVersion() As String
	
End Class

Public Class clsLicenceSentinel

	Inherits clsLicence
	
    Public Property strProgramNameAndMajorVersion() As String
        Get
		'....
		End Get
        Set(ByVal Value As String)
		'....
        End Set
    End Property
	
End Class

Public Class clsLicenceSoftwareKey

	Inherits clsLicence
	
    Public Property strProgramNameAndMajorVersion() As String
        Get
		'....
		End Get
        Set(ByVal Value As String)
		'....
        End Set
    End Property
	
End Class

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So I have 2 Child classes, clsLicenceSentinel and clsLicenceSoftwareKey, with Parent Class, clsLicence.

How do I define Property strProgramNameAndMajorVersion()  so that the appropriate definition in the Child class is used?

Regards,
Leigh