logging through config files

app.config.xml

<system.diagnostics>
  <trace autoflush="true" indentsize="4">
    <listeners>
      <add name="fileLog" type="System.Diagnostics.TextWriterTraceListener" initializeData="application.log" />
      <add name="consoleLog" type="System.Diagnostics.ConsoleTraceListener" />
      <add name="eventLog" type="System.Diagnostics.EventLogTraceListener" initializeData="TraceLog" />
    </listeners>
  </trace>
</system.diagnostics>