private void AddOffer() { Console.WriteLine("Write index of visitor:\n"); int ind = Convert.ToInt16(Console.ReadLine()); if (visitorsList.GetInfo(ind).offers.Offer.Count >= 5) { throw new Exception("Can't add more offers"); } Console.WriteLine("Write index of book:\n"); int index = Convert.ToInt16(Console.ReadLine()); visitorsList.AddOffer(ind, docsList.GetInfo(index)); Console.WriteLine("Succesfull"); Console.ReadKey(); }