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CellRangeAddressList regions = new CellRangeAddressList(24, sheet.LastRowNum, 541, 590);
XSSFDataValidationConstraint constraint = new XSSFDataValidationConstraint(new string[] { "" });
CT_DataValidation datavalidation = new CT_DataValidation();
XSSFDataValidation dataValidate = new XSSFDataValidation(constraint,regions, datavalidation);
sheet.AddValidationData(dataValidate);