public void UpdateLaborType(int id, string description)
        {
            var existing = AccountTypeRepository.GetLaborType(id);

            if (null == existing)
            {
                throw new ArgumentException(string.Format("{0} is not a valid labor type id", id));
            }
            //TODO: validate description
            existing.Description = description;
            AccountTypeRepository.SaveLaborType(existing);
        }
        public void AddLaborType(string description)
        {
            var existing = AccountTypeRepository.GetLaborTypes();

            if (null != existing.Where(e => e.Description == description).FirstOrDefault())
            {
                throw new InvalidOperationException(string.Format("{0} already exists as a labor type", description));
            }
            AccountTypeRepository.SaveLaborType(new LaborType()
            {
                Description = description
            });
        }