In my Data class, I have this also as definitions:

    Public oDataSet As DataSet = Nothing
    Public oDataTable As DataTable = Nothing
    Public oDataView As DataView = Nothing
    Public oParameters As ArrayList = New ArrayList
    Public oRow As DataRow = Nothing
    Public oRowInitial As DataRow = Nothing
    Public oRows As DataRowCollection = Nothing

The cloning, as it was before, worked for the parameters. So, I assume oParameters is a value type.

I would then assume for the cloning to work, I would need to copy as well the other ones in here as they are not value types.