[Firebird-net-provider] simple procedure in vb.net

[Dmitry A. <fd...@ua...>]

Hello firebird-net-provider,

  i have simple procedure in vb.net:

    Private Sub SaveDMDetails()
        If Not bmdtDMDetails.Current.GetType() Is GetType(DataRowView) Then
            Return
        End If
        bmdtDMDetails.EndCurrentEdit()

        If DataTableHasChanges(dtDMDetails) Then
            Try
                con.Open()
                Dim _transaction As FbTransaction = con.BeginTransaction( _
                    FbTransactionOptions.NoWait Or _
                    FbTransactionOptions.ReadCommitted Or _
                    FbTransactionOptions.RecVersion _
                    )

                dtaDMDetails.SelectCommand.Transaction = _transaction

                dtaDMDetails.Update(dtDMDetails)

                _transaction.Commit()
                con.Close()
            Catch ex As Exception
                MessageBox.Show(ex.Message)
            End Try

            ' Возможно стоит обновить что-то на форме...
            Dim drvDMDetails As DataRowView = bmdtDMDetails.Current
            Dim drvList As DataRowView = bmdvDivsMembership.Current
            drvList("EMPLOYE") = drvDMDetails("EMPLOYE")
            drvList("SUBDIV") = drvDMDetails("SUBDIV")
            drvList("STAFFBYWORK") = drvDMDetails("STAFFBYWORK")
            drvList("RANK") = drvDMDetails("RANK")
        End If
    End Sub

    and it's work fine... but on 3th edition & save of record i'm got
    exception NullReferenceException in this call:
                dtaDMDetails.Update(dtDMDetails)

    Can't understand what's this... :( Can't find bug :((
    And this not fb-provider bug :) or i can't create test case :(

-- 
Best regards,
 Dmitry                          mailto:fd...@ua...