Shutdown the repository
Shutting down a repository will safely close and remove all appenders in all loggers including the root logger.
Some appenders need to be closed before the application exists. Otherwise, pending logging events might be lost.
The Shutdown method is careful to close nested appenders before closing regular appenders. This is allows configurations where a regular appender is attached to a logger and again to a nested appender.
ILoggerRepository Interface | log4net.Repository Namespace