找不到ConfigurationManager

問題：第一次寫C#,在命名空間中已經使用了using System.Configuration;可是使用Configuration時卻沒法使用;

解決方案：在解決方案資源管理器中，右擊「引用」，「添加引用」，把「System.Configuration」添加進來就能夠了;

問題2：爲何using System.Configuration;後還須要添加System.Configuration;

理解：When you add the reference you are asking the dll to be copied to the bin folder on compile/ build. Some dll's seen as core are added when the project is created, ie when you go file->new project so the references are set up at that point. They all have to go through the same process just that some are done for you and some you have to do manually. You could test it out by deleting the reference to your System dll and watching all your code fail.

(有時間再翻譯給你們 : )