show tooltip in rad grid for unitprice for productcs  try

                                {
                                    product.GetAveragePriceLastDays(14, out unitPrice);
                                }
                                catch (Exception ex)
                                {
                                    string error = "Error: " + ex.Message;
                                    gdi[gc].ToolTip = error;
                                    (Page.Master as dynamic).MasterRadNotification.Show(error);
                                    continue;
                                }