一个用于注册时的验证码的类，用CSharp编写的。希望能对大家有用！-register for a certification category code, prepared by using CSharp. We hope that the useful!

一个用于注册时的验证码的类，用CSharp编写的。希望能对大家有用！-register for a certification category code, prepared by using CSharp. We hope that the useful!

班级信息管理系统，能够实现班级的管理，课程管理，学生信息管理，成绩管理等功能。-Class information management system, to achieve class management, curriculum management, student information management, performance management.