I am not able to save a record due to the following Business Rule not passing.
Any thoughts on how I can correct my code to restrict the values to "Square", "RectangleLandscape" or "RectanglePortrait"?

The value being tested, companyLogoShape, gets a database default of "Square" and this value is bound to a combobox that would only permit acceptable values yet I am not ever passing the validation criteria of my Business Rules object detailed below:

' Validate the CompanyLogoShape
    Public Function ValidateCompanyLogoShape(ByVal companyLogoShape As String) As String
        Dim message As String = Nothing

        If companyLogoShape <> "Square" _
            Or companyLogoShape <> "RectangleLandscape" _
            Or companyLogoShape <> "RectanglePortrait" Then
            message = "Logo Shape must be either Square, " _
            + "RectangleLandscape, or RectanglePortrait"
            Me.AddErrorProviderBrokenRule("CompanyLogoShape", message)
        End If
        Return message
    End Function