public static AttributeValueId ParseIdString(string idString)
        {
            var formatter = new AttributeValueIdFlattenedDtoFormatter();
            var idDto     = formatter.Parse(idString);
            var rId       = idDto.ToAttributeValueId();

            return(rId);
        }
        public static string ToIdString(AttributeValueId id)
        {
            var formatter = new AttributeValueIdFlattenedDtoFormatter();
            var idDto     = new AttributeValueIdFlattenedDto(id);
            var idStr     = formatter.ToString(idDto);

            return(idStr);
        }