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//读配置文件 方法(1) 
//ConfigurationManager.RefreshSection("appSettings"); //强制重新载入
string settingValue = ConfigurationManager.AppSettings.Get("setting1"); 

//读配置文件 方法(2) 
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
string settingValue = config.AppSettings.Settings["setting1"].Value; 

//写配置文件 
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.AppSettings.Settings["setting1"].Value = "123";
config.Save(ConfigurationSaveMode.Modified); 

//App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="setting1" value="123" />
  </appSettings>
</configuration>