<configSections>
 <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
 </configSections>
 <log4net>
 <appender name="rollingFile" type="log4net.Appender.RollingFileAppender,log4net">
 <param name="File" value="log/" />
 <param name="AppendToFile" value="true" />
 <param name="RollingStyle" value="Date" />
 <param name="DatePattern" value="yyyy-MM-dd&quot;.log&quot;" />
 <param name="StaticLogFileName" value="false" />
 <layout type="log4net.Layout.PatternLayout">
 <param name="ConversionPattern" value="%n%r %p[%d %c] %m%n" />
 </layout>
 </appender>
 <root>
 <level value="ALL" />
 <appender-ref ref="rollingFile" />
 </root>
 
 <logger name="WebLogger">
 <level value="ALL" />
 <appender-ref ref="rollingFile" />
 </logger>
 </log4net>

log4net.Config.XmlConfigurator.Configure();

public class MyLog
{
 
 private static readonly log4net.ILog log = log4net.LogManager.GetLogger("WebLogger");
 
 public MyLog()
 {
 
 }
 private static void SetConfig()
 {
 object o = ConfigurationManager.GetSection("log4net");
 log4net.Config.XmlConfigurator.Configure(o as System.Xml.XmlElement);
 }
 
 public static void LogInfo(string Message)
 {
 if (!log.IsInfoEnabled)
 SetConfig();
 log.Info(Message);
 }
 
 public static void LogInfo(string Message, Exception ex)
 {
 if (!log.IsInfoEnabled)
 SetConfig();
 log.Info(Message, ex);
 }
 public static void ErrorInfo(string Message)
 {
 if (!log.IsInfoEnabled)
 SetConfig();
 log.Error(Message);
 }
 
 public static void DebugInfo(string Message)
 {
 if (!log.IsInfoEnabled)
 SetConfig();
 log.Debug(Message);
 }
}