Can anybody help?

I have the following SolidWorks VBA macro...

Public Function GetCustomProperties()
    Dim FileError As Long

    Dim FileWarning As Long

    Set swApp = Application.SldWorks

    swApp.DocumentVisible False, swDocumentTypes_e.swDocPART

    Set oDoc = swApp.OpenDoc6("C:\Test\Test.sldprt", swDocPART, swOpenDocOptions_Silent, "", FileError, FileWarning)

    PartType = oDoc.GetCustomInfoValue("", "Part: Type")

    PartMaterial = oDoc.GetCustomInfoValue("", "Part: Material")

    Description = oDoc.GetCustomInfoValue("", "Part: Description")

    swApp.DocumentVisible True, swDocumentTypes_e.swDocPART
End Function

Do I have to "close" the open document after I have read the values?

Many thanks in advance!!!

Darren