DataAdapter does not update a record

Hi, I have been researching all that is related to DataSources, DataReaders, DataAdapters, etc, with an Access 2010 DB bound to a DataGridView.


Everything is fine, just one line fails and is driving me nuts!
Here is the code:

Code:

---

Private Sub ModificaPrecios()
        Dim mensaje As String
        Dim variacion As Integer
        Dim i As Int32

        mensaje = "¿Esta seguro que desea "
        If rdbAumento.Checked Then
            mensaje = mensaje & "aumentar un "
        Else
            mensaje = mensaje & "descontar un "
        End If
        If txPorcentaje.Text.Length > 0 Then
            mensaje = mensaje & txPorcentaje.Text & " porciento de sus listas de precios?"
            If MessageBox.Show(mensaje, "Actualizo", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) = DialogResult.Yes Then
'I asked if user is sure to change the column
'rdbAumento states whether the column value is increased or decreased
                If rdbAumento.Checked Then
                    variacion = Convert.ToInt32(txPorcentaje.Text)
                    For i = 0 To gridPrecios.Rows.Count - 2
                        gridPrecios.Item(5, i).Value = (gridPrecios.Item(5, i).Value * (100 + variacion) / 100)
                    Next
                Else
                    variacion = Convert.ToInt32(txPorcentaje.Text)
                    For i = 0 To gridPrecios.Rows.Count - 2
                        gridPrecios.Item(5, i).Value = (gridPrecios.Item(5, i).Value * (100 - variacion) / 100)
                    Next
                End If
            End If
        End If
        UpdateGrilla()
    End Sub

    Private Sub UpdateGrilla()
        Dim cb As New OleDb.OleDbCommandBuilder(da)

'If txporcentaje.text is not null, then user increased or decreased ALL THE COLUMN with the For above. Else, The user just changed ONCE CELL MANUALLY
        If txPorcentaje.Text <> nothing Then
            If MsgBox("Desea guardar los cambios realizados?", MsgBoxStyle.Exclamation + MsgBoxStyle.YesNo, "WARNING") = MsgBoxResult.Yes Then


'This line is failling. See below for description
                da.Update(ds, "datos")

                'Hubocambio se usa para meter datos a HistorialPrecios
                hubocambio = True
            End If
        Else
            If MsgBox("Save data?.", MsgBoxStyle.Exclamation + MsgBoxStyle.YesNo, "WARNING") = MsgBoxResult.Yes Then

'The odd thing that is killing me is that this line is NOT failing.
                da.Update(ds, "datos")

                'Hubocambio se usa para meter datos a HistorialPrecios
                hubocambio = True
            End If
        End If
        If hubocambio Then
            InsertaCambioPrecio()
        End If

    End Sub

    Private Sub InsertaCambioPrecio()
        'Some routine that saves a record as a log of what is being done.
    End Sub

---

The line that fails, actually updates my database, but somehow, the update is not performed on the line that belongs to the first row of the grid. What is more, if I change the value manually, the same update method works fine. What is going on here?

Thanks!

Because it's still in this statement?

Code:

---

      If txPorcentaje.Text.Length > 0 Then

---

I'm not sure I got your point there. Sorry, English is not my native language :(

This is the form at runtime:
http://img692.imageshack.us/img692/8976/formww.jpg

In any case, that line works like this:

if txporcentaje.lenght > 0 states that the textbox has some text. In this case, '10' is telling me that I have to apply a 10% increase to column 'Precio', hence the For loop afterwards.

If it doesn't have text at all, then I assume the user changed a cell manually (on purpose or by accident) thus, there is no For loop there and I double check the user is sure to do so.

When all this has been executed (either For loop or cell changed manually), I call the function "UpdateGrilla()" which uses the DataAdapter to save those changes to my DB. If manual change was done, DA works just fine. If the For was executed, DA misses grid's first record. This is what is thrilling me. I mean, da.update is automated, isn't it?

Thanks for your time!

Sure you want a NEW instance here? Why not pass the old one?

Code:

---

    Dim cb As New OleDb.OleDbCommandBuilder(da)

---

Nice catch!

I developed that small code in another project and I am re-using it. Thanks for that mate!