public static FormattingRule AddZeroNullFormattingRule(this XtraReport report, string dataMember)
        {
            var result = new FormattingRule();

            report.FormattingRuleSheet.Add(result);
            result.Condition            = $"[{report.JoinWithDataMember(dataMember)}] == 0";
            result.Formatting.ForeColor = Color.Transparent;
            return(result);
        }