Navigation in dataset going backwards when asking to go next

vb.net 2003
access 2003 backend

loading the dataset via code:   no textboxes are bound...all are unbound..
Dim das1 As New System.Data.DataSet()
    Dim cnn1 As New OleDb.OleDbConnection( _
                "Provider=Microsoft.Jet.OLEDB.4.0;" & _
                "Data Source=c:\Program Files\" & _
                "Crs_iCart\Beta_2010_Crs_iCart.mdb")
    Dim query As String = "SELECT * FROM tblMainData Order By MainTableID DESC "
    Dim dap1 As New System.Data.OleDb.OleDbDataAdapter(query, cnn1)
   
Problem:
The data loads as I ask: the Maintable id is descending.
so If I have 21 records record id "21" shows up


Weird Part:
When I press the "next" it should do nothing..
But The records go to the previous record ?
21..20..19  etc...

When I press "previous" it does nothing ?

Thanks
fordraiders

Private Sub btnNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNext.Click
        'Move to next position
        Me.BindingContext(das1, "tblMainData").Position += 1
    End Sub

Private Sub btnPrevious_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPrevious.Click
        'Move to previous position
        Me.BindingContext(das1, "tblMainData").Position -= 1
    End Sub

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