AddConfigurator config = new AddConfigurator("app.config"); config.AddSetting("SmtpServer", "smtp.example.com");In this example, the AddConfigurator instance is created with the name "app.config", which corresponds to the configuration file for the application. The method then adds a new key-value pair to the configuration section, with the key "SmtpServer" and the value "smtp.example.com". The package library for the AddConfigurator class is the System.Configuration namespace, which is part of the .NET Framework Class Library.