警告："System.Configuration.ConfigurationSettings.GetConfig(string)”已过时

在VS 2005中，经常会使用到ConfigurationSettings类来读取应用程序配置文件的信息，以获取数据库连接的字符串，但是，经常会出现如下的错误：
警告“System.Configuration.ConfigurationSettings.GetConfig(string)”已过时:“This method is obsolete, it has been replaced by System.Configuration!System.Configuration.ConfigurationManager.GetSection”
警告 1 “System.Configuration.ConfigurationSettings.AppSettings”已过时:“This method is obsolete, it has been replaced by System.Configuration!System.Configuration.ConfigurationManager.AppSettings”

解决方法:
首先添加对System.Configuration.dll 文件的引用，既在该项目中添加引用，在浏览中找到System.Configuration.dll文件，一般该文件在C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727文件夹中；
其次再把.net 1.0下的“System.Configuration.ConfigurationSettings.AppSettings”索引器换成.net 2.0下的“System.Configuration.ConfigurationManager.AppSettings”索引器。把"System.Configuration.ConfigurationSettings.GetConfig换成System.Configuration.ConfigurationManager.GetSection