HELP!! VB to C# problem for you C# guru's

[pcplayer]

.Net 1.1
I have created a dll in VB. This dll sets may different properties I am only having trouble with the dataset property. The APPNVPS is initialized with the user Id and password and sets the values to be consumed by my apps.

This is the code in Vb which works correctly
APPNVPS is a dll call which returns a dataset

Dim newObject As New APPNVPS(USERID, PASSWORD)
        Dim dsValues As New DataSet
        Dim stValue As String
        dsValues = newObject.AppValues
        If dsValues.Tables(0).Rows.Count > 0 Then
            MessageBox.Show("There are " & dsValues.Tables(0).Rows.Count & " records")
        End If
The Message box show that I have 16 record

C# code
DataSet ds = new DataSet();
APPNVPS objApp = new APPNVPS(UserID,Password);
ds = objApp.AppValues;
MessageBox::Show ds.Tables[0].row.count;

Gives me a runtime error <undefined value> null value
I know that I am not fluent in C# but this can't be that difficult.