一个用C#编写的学生选课管理信息系统，需要连接到SQL数据库对实现数据库数据的显示、修改等一系列操作，上传文件内已包含数据库。-Written in C# a student elective management information systems, need to be connected to a series of operations of the SQL database on the database data display, modify, upload a file th