Class CustomComparer : Implements IComparer
    Public Function CompareTo(ByVal o1 As Object, _
                              ByVal o2 As Object) As Integer _
                              Implements IComparer.Compare
        Dim num1, num2 As Integer

        Try
            num1 = CType(o1, Integer)
            num2 = CType(o2, Integer)
        Catch compareException As system.Exception
            Throw (compareException)
            Exit Function
        End Try
        If Math.Cos(num1) < Math.Cos(num2) Then
            Return -1
        Else
            If Math.Cos(num1) > Math.Cos(num2) Then
                Return 1
            Else
                Return 0
            End If
        End If
    End Function
End Class