>>An ArrayList( oParameters ) is a reference type
>>
>>If the ArrayList is not going to be changed - you can use the reference
>
>Ok, so far I have this:
>
>

>    ' Clone this object
>    Public Function Clone() As Object Implements System.ICloneable.Clone
>        Dim loData As Data = DirectCast(MemberwiseClone(), Data)
>
>        ' Add to the cloning object the dataset as well
>        ' MemberwiseClone only copies value types
>        ' So just returning Return MyBase.MemberwiseClone() would not do if after the cloning the access to the original dataset is needed
>        loData.oDataSet = loData.oDataSet.Copy()
>        loData.oDataTable = loData.oDataTable.Copy()
>
>        Return loData
>    End Function
>

>
>I had to evolve it as it was not working entirely as I have more properties that need to be cloned.
>
>The oDataTable returns "Object reference not set to an instance of an object". This is on the second Copy here. I am not sure why that one cannot work.

I think oDataTable is null. If it is, you cannot copy it. Only copy if oDataTable is not null