How can I use several Application Configuration Files in one project?

Question

After creating new Visual C# Console Application (.NET Framework 4.5), such project contains default App.config file.

Answer 1

It can be done using mapped config file ,

ExeConfigurationFileMap configFileMap = 
        new ExeConfigurationFileMap();
    configFileMap.ExeConfigFilename = "App4.config"; // full path to the config file

    // Get the mapped configuration file
   Configuration config = 
      ConfigurationManager.OpenMappedExeConfiguration( 
        configFileMap, ConfigurationUserLevel.None);

   //now on use config object

AppSettingsSection section = (AppSettingsSection)config.GetSection("appSettings");