public object?GetNthMask(int index)
            {
                HeadPartReference_FieldIndex enu = (HeadPartReference_FieldIndex)index;

                switch (enu)
                {
                case HeadPartReference_FieldIndex.Number:
                    return(Number);

                case HeadPartReference_FieldIndex.Head:
                    return(Head);

                default:
                    throw new ArgumentException($"Index is out of range: {index}");
                }
            }
            public void SetNthMask(int index, object obj)
            {
                HeadPartReference_FieldIndex enu = (HeadPartReference_FieldIndex)index;

                switch (enu)
                {
                case HeadPartReference_FieldIndex.Number:
                    this.Number = (Exception?)obj;
                    break;

                case HeadPartReference_FieldIndex.Head:
                    this.Head = (Exception?)obj;
                    break;

                default:
                    throw new ArgumentException($"Index is out of range: {index}");
                }
            }