在线作业系统源码,用了公共类的编写，用access存储数据，还用到导出学生作业完成信息到xls，后台地址是admin 用户名密码均为51aspx 前台测试登陆学号是51 密码是51aspx -Online operating system source code, with the preparation of a public class, access stored data, also used to export student work completed to xls, b