log4net

on Start: 
log4net.Config.XmlConfigurator.Configure();
 
Debugging:
First you have to set this value on the application configuration file:
<configuration>
   <appSettings>
      <add key="log4net.Internal.Debug" value="true"/>
   </appSettings></configuration>
Then, to determine the file in which you want to save the output you can add the following code in the same .config file:
<configuration>
...

<system.diagnostics>
    <trace autoflush="true">
        <listeners>
            <add 
                name="textWriterTraceListener" 
                type="System.Diagnostics.TextWriterTraceListener" 
                initializeData="C:\tmp\log4net.txt" />
        </listeners>
    </trace></system.diagnostics>

...
</configuration>
You can find a more detailed explanation looking for 'How do I enable log4net internal debugging?' in the log4net FAQ page:
Config for Log File:
    < appender name =" AvgFileAppender" type="log4net.Appender.RollingFileAppender" >
      < file value =" .\\App_Data\\Log4Net.Logs\\backend.log" />
      < lockingModel type =" log4net.Appender.FileAppender+MinimalLock " />
      < appendToFile value =" true" />
      < rollingStyle value =" Size" />
      < maxSizeRollBackups value =" 10" />
      < maximumFileSize value =" 3MB" />
      < staticLogFileName value =" true" />
      < layout type =" log4net.Layout.PatternLayout">
        < param name =" ConversionPattern" value="%d [%t] %-5p %c %m%n" />
      </ layout>
    </ appender>
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