variable/property changed event in vb.net

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From the MSDN library entry INotifyPropertyChanged.PropertyChanged Event:

Public Class DemoCustomer
    Implements INotifyPropertyChanged

    Private customerNameValue As String = String.Empty

    Public Event PropertyChanged As PropertyChangedEventHandler _
        Implements INotifyPropertyChanged.PropertyChanged

    Private Sub NotifyPropertyChanged(ByVal info As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info))
    End Sub

    Public Property CustomerName() As String
        Get
            Return Me.customerNameValue
        End Get

        Set(ByVal value As String)
            If Not (value = customerNameValue) Then
                Me.customerNameValue = value
                NotifyPropertyChanged("CustomerName")
            End If
        End Set
    End Property
End Class

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