Log4net File gets locked even though browser site is closed

I am using VS 2013 and Log4Net to log data for a .Net application. I can create logs. But when i try to delete or move the log file , it says

The file is open in another process... 

This message i get even though the browser is closed. I am only able to edit/cut/ rename.. the log file when i close the Visual studio IDE tool. How can i solve this problem. I want the ability to delete / edit the file whenever i want. Here is the code for log4net used in web.config

 <configSections>
 <section name="log4net" 
 type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
 </configSections>

 <log4net>
   <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
   <file value="c:\logs\jwhXMLDev.log" />
   <appendToFile value="true" />
   <!-- <layout type="log4net.Layout.XmlLayout"/>-->
   <layout type="log4net.Layout.XmlLayout" />
   </appender>
   <appender name="MemoryAppender" type="log4net.Appender.MemoryAppender">
   <onlyFixPartialEventData value="true" />
   </appender>
<root>
  <level value="ALL" />
  <appender-ref ref="RollingFile" />
</root>
</log4net>