Не удается отследить RowState

Dim cm As CurrencyManager = CType(BindingContext(Me.Tbl.DataSource, Me.Tbl.DataMember), CurrencyManager)
        Dim rv As DataRowView = CType(cm.Current, DataRowView)

        If DataRowState.Modified = True Then MsgBox("dd")
      MsgBox(rv.Row.RowState.ToString)

  Me.Ds.Tbl.Rows(0).RowState