public string payBill(Bills bill) { int id = bill.getBillId(); int enrid = bill.getEnrolleeId(); double deductible = Convert.ToDouble(DBMng.getDeductible(enrid)); if (deductible > bill.getAmount()) { DBMng.updateDeductible(enrid, Convert.ToInt32(deductible - bill.getAmount())); DBMng.updateIsPaid(id); } else { DBMng.updateDeductible(enrid, 0); DBMng.updateIsPaid(id); } return("Bill has been paid."); }