MAC adresse fra WMI

Hej

Jeg skal have alle de mac adresser der er på PC'en men får kun den første.

Min kode:
Function GetMacAddress() As String
Dim brugerid As String
        brugerid = LoginForm1.txtusername.Text
        Try
            Dim strMACAddress As String = ""
            '
            ' Create the query, in SQL syntax, to retrieve the properties from
            ' the active Network Adapter.
            '
            Dim strQuery As String = _
                "SELECT * FROM Win32_NetworkAdapterConfiguration WHERE IPEnabled = True"

            '
            ' Create a ManagementObjectSearcher object passing in the query to run.
            '
            Dim query As ManagementObjectSearcher = New ManagementObjectSearcher(strQuery)

            '
            ' Create a ManagementObjectCollection assigning it the results of the query.

            Dim queryCollection As ManagementObjectCollection = query.Get()

            '
            ' Loop through the results extracting the MAC Address.
            '
            Dim mo As ManagementObject

            For Each mo In queryCollection
                strMACAddress = mo("MacAddress").ToString()
                DatabaseForbindelse("Insert into mac(brugerid,mac) values('" & brugerid & "','" & strMACAddress & "')")
                'Exit For
            Next

            Return strMACAddress

        Catch ex As Exception
            Return "Fejl"
        End Try

End function

Nogen der ved hvordan jeg kan gøre det ?