title: Just curious about log4net log details
body: <p>Am using Log4Net to log my application,everything works fine to me, just wanna understand little bit more about the log details.</p>
  
  <p>Here is my log:</p>
  
  <pre><code>2012-05-22 17:11:44,602 **[11]** ERROR Shell Exists - ignoreThe remote server returned an erro:
  2012-05-29 15:48:11,876 **[32]** ERROR Shell Exists - ignoreThe remote server returned an error: (550) File unavailable (e.g., file not found, no access).
  </code></pre>
  
  <p>Here is my config:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender,log4net"&gt;
    &lt;appendToFile value="true" /&gt;
    &lt;maxSizeRollBackups value="30" /&gt;
    &lt;maximumFileSize value="5MB" /&gt;
    &lt;rollingStyle value="Size" /&gt;
    &lt;staticLogFileName value="false" /&gt;
    &lt;lockingModel type="log4net.Appender.FileAppender+MinimalLock" /&gt;
    &lt;file value="c:\Error.log"/&gt;
    &lt;param name="AppendToFile" value="true"/&gt;
    &lt;filter type="log4net.Filter.LevelRangeFilter"&gt;
      &lt;param name="LevelMin" value="ERROR"/&gt;
      &lt;param name="LevelMax" value="ERROR"/&gt;
    &lt;/filter&gt;
    &lt;layout type="log4net.Layout.PatternLayout"&gt;
      &lt;param name="ConversionPattern" value="%d [%t] %-2p %c %method - %m%n"/&gt;
    &lt;/layout&gt;
  </code></pre>
  
  <p>Just want to know what is <strong>[11] or [32]</strong> in my log file after time stamp, what it refers here ? hope some one will update my knowledge.</p>