How to generate nlog for specific log size

I am trying to generate the nlog for specific log size but dont get a way around to do this can some one please help. I am using the following nlog also i would like to change the location of current log file to a new log file location

<targets>
  <target name="f1" xsi:type="File" fileName="test.log.txt" layout="${threadname} ${longdate}   
${callsite} ${logger}[${level}] ${message}" />
  <target name="console" xsi:type="Console" layout="${threadname} ${longdate} ${callsite}   
${logger}[${level}] ${message}" />
</targets>
<rules>
  <!--<logger name="Quartz.*" level="Warn" />-->
  <logger name="*" writeTo="f1" minlevel="Info" />
  <logger name="*" writeTo="console" minlevel="Debug" />
</rules>
  </nlog>
  <common>
<logging>
  <factoryAdapter type="Common.Logging.NLog.NLogLoggerFactoryAdapter, Common.Logging.NLog20">
    <arg key="configType" value="INLINE" />
  </factoryAdapter>
</logging>