public IEnumerable <string> Validate()
        {
            if (string.IsNullOrEmpty(Id) || string.IsNullOrWhiteSpace(Id))
            {
                yield return(IdCantBeNull.ToString());
            }

            if (Genders.IsEmpty())
            {
                yield return(OneGenderRequired.ToString());
            }

            if (Units.IsEmpty())
            {
                yield return(OneUnitRequired.ToString());
            }
        }