开发语言是C#，可以用于发送邮件，运行时修改数据库名，登录名和密码和邮箱地址Development language is C#, can be used to send mail, run-time modify the database name, login name and password and email addre-Development language is C#, can be used to send mail, run-time modify the database name, login name and password and email address