public ManagerService()
        {
            Context = new SalesContext();

            // Locker = new ReaderWriterLockSlim();

            ManagerDbReaderWriter = new ManagerDbReaderWriter(Context);
        }
        public ManagerService()
        {
            Context = new SalesInformationEntities();

            Locker = new ReaderWriterLockSlim();

            ManagerDbReaderWriter = new ManagerDbReaderWriter(Context, Locker);
        }