1. Create a config file calls 'log4net.config', and put it in 'c:\log\'

2. Create a Class Library Project call 'MyLogging', add a reference for log4net.dll. Add a new Class calls 'Logger.cs'.

public class Logger    {        private const string LOG4NET_CONFIG_FILE = "C:\\log\\log4net.config";        private log4net.ILog logger;        private Logger()        {            log4net.Config.XmlConfigurator.Configure(new System.IO.FileInfo(LOG4NET_CONFIG_FILE));        }        public Logger(string loggerName)            : this()        {            logger = log4net.LogManager.GetLogger(loggerName);        }        public Logger(Type type)            : this()        {            logger = log4net.LogManager.GetLogger(type);        }        #region ILog Members        public void Debug(object message)        {            if (logger.IsDebugEnabled)                logger.Debug(message);        }        public void Debug(object message, Exception ex)        {            if (logger.IsDebugEnabled)                logger.Debug(message, ex);        }        public void Info(object message)        {            if (logger.IsInfoEnabled)                logger.Info(message);        }        public void Info(object message, Exception ex)        {            if (logger.IsInfoEnabled)                logger.Info(message);        }        public void Warn(object message)        {            if (logger.IsWarnEnabled)                logger.Warn(message);        }        public void Warn(object message, Exception ex)        {            if (logger.IsWarnEnabled)                logger.Warn(message, ex);        }        public void Error(object message)        {            if (logger.IsErrorEnabled)                logger.Error(message);        }        public void Error(object message, Exception ex)        {            if (logger.IsErrorEnabled)                logger.Error(message, ex);        }        public void Fatal(object message)        {            if (logger.IsFatalEnabled)                logger.Fatal(message);        }        public void Fatal(object message, Exception ex)        {            if (logger.IsFatalEnabled)                logger.Fatal(message, ex);        }        #endregion    }