一个功能相对简单的C＃学生成绩管理系统，需要使用数据库，它原来的名字是“HYF学生成绩管理系统”，下载后改为原名就可以正常-A function is relatively simple c# student performance management system, the need to use the ，Its original name was HYF student achievement management system to download later changed t