var textLengthCondition = new GC.Spread.Sheets.ConditionalFormatting.Condition(GC.Spread.Sheets.ConditionalFormatting.ConditionType.textLengthCondition);
textLengthCondition.compareType(GC.Spread.Sheets.ConditionalFormatting.GeneralComparisonOperators.greaterThan);
textLengthCondition.expected(5);
var validator = new GC.Spread.Sheets.DataValidation.DefaultDataValidator(textLengthCondition);
validator.type(GC.Spread.Sheets.DataValidation.CriteriaType.custom);
activeSheet.getCell(0, 0, GC.Spread.Sheets.SheetArea.viewport).validator(validator);
spread.options.highlightInvalidData = true;
activeSheet.setValue(0, 0, "abcf");