一个列车车次查询系统，使用C#开发，有帮助文档

火车售票系统 (1) 实现售票、退票、车票剩余情况查询等功能。 (2) 每张车票包含车次、座位等信息。 -Train ticketing system (1) to achieve ticketing, refund, tickets remaining cases query. (2) Each ticket includes trips, seats and other information.