public static void createProductType(string productTypeName, string description, out string errorMessage) { ProductType isExist = getProductTypeByName(productTypeName); if (isExist == null) { bool success = checkConstraintProductType(productTypeName, description, out errorMessage); if (success == true) { ProductTypeHandler.doCreateProductType(productTypeName, description); errorMessage = "Success"; } } else { errorMessage = "The Product Type Name is Exist !"; } }