开始使用VS 2005，习惯性的使用ConfigurationSettings类来读取应用程序配置文件的信息时，却被编译器提示说：警告 1 “System.Configuration.ConfigurationSettings.AppSettings”已过时:“This method is obsolete, it has been replaced by System.Configuration!System.Configuration.ConfigurationManager.AppSettings” 于是转而想找到那个ConfigurationManager类来使用，结果在System.Configuration命名空间下死活找不到ConfigurationManager类，无奈，求助于网络，才知道原来还要添加对System.Configuration.dll 文件的引用~~事后才留意到，原来MS对这一点还是提示了一下的，只不过比较隐晦而已——This method is obsolete, it has been replaced by System.Configuration!System.Configuration.ConfigurationManager.AppSettings注意到没有，上面这段话多了System.Configuration!这段~
