title: Windows username in the filename of the log4net output
body: <p>I'm implementing a VB.NET (C# is ok too) app that will be run in the same time by different users.</p>
  
  <p>I need to log all users events in separate files named like thiswindowsuser-20170103.log</p>
  
  <p>Is possible to configure log4net to work this way ?</p>