private void InitCoupons() { Coupon coupon1 = new Coupon(); Coupon coupon2 = new Coupon(); Coupon coupon3 = new Coupon(); coupon1.Id = 1; coupon1.Luggages = Luggages; coupon1.Flight = Flights.Find(f => f.Id == 1); coupon2.Id = 2; coupon2.Flight = Flights.Find(f => f.Id == 2); coupon2.Luggages.Add(Luggages.Find(l => l.Weight == 50)); coupon3.Id = 3; Coupons.Add(coupon1); Coupons.Add(coupon2); Coupons.Add(coupon3); Flights.Find(f => f.Id == 1).Coupons.Add(coupon1); Flights.Find(f => f.Id == 2).Coupons.Add(coupon2); }