// GET: api/Customers
        public async Task <IQueryable <Customer> > GetCustomers()
        {
            Expression <Func <Customer, bool> > Expression;

            Expression = x => x.ID != 0;

            Expression = Utils.Combine(Expression, x => x.CustomerStatus == CustomerStatus.active);


            var customers = await _customersRepository.FindAll(Expression);

            return(customers);
        }