用C#写的一段关于数据库连接的库，使用时，只需将:"string M_str_sqlcon="Data Source=pc1\\SQLEXPRESS uid=sa pwd=root database=db_Tools" "中的个字段替换成自己的数据库字段，然后编译成*.dll文件即可使用。该方法的好处是，只要写一处关于数据库连接的命令，对于程序维护很方便。-Paragraph on the database connection library written in C#, use, simply: " the string M_str_sqlcon = the"　Data Source = pc1 \ \ SQLEXPRESS　the uid = sa　pwd = root　database = db_Tools "　 in the field replaced with your own database fields, and then compiled into dll file to use. The benefit of this method is to write a command on the database connection is very convenient for program maintenance.