public IHttpActionResult PayBill(PaidBillsMap paidBillsMap)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest());
            }
            else
            {
                _context.PaidBillsMap.Add(paidBillsMap);
                _context.SaveChanges();

                return(Created(new Uri(Request.RequestUri + "/" + paidBillsMap.PaidBillsMapId), paidBillsMap));
            }
        }
        public void UnpayBill(PaidBillsMap paidBillsMap)
        {
            var billInDB = _context.PaidBillsMap
                           .SingleOrDefault(b => b.MonthlyBillId == paidBillsMap.MonthlyBillId &&
                                            b.Month == paidBillsMap.Month &&
                                            b.Year == paidBillsMap.Year);

            if (billInDB == null)
            {
                throw new HttpResponseException(HttpStatusCode.NotFound);
            }
            else
            {
                _context.PaidBillsMap.Remove(billInDB);
                _context.SaveChanges();
            }
        }