How to do configuration in assembly.cs file for log4net implementation?

I am trying to implement the log4net. In my project ,i am referring a dll project,which has the log4net implementation and i am calling the dll from from my asp number.

The call is successful from asp to dll method and the logger is created just fine.

private static readonly ILog log = LogManager.GetLogger(typeof(ErrorLogging).Name);

But the problem is the logger is not enabled. I mean IsErrorEnabled/IsDebugEnabled are false.

The confusing part to me is assembly.cs,in which the place where we mention the

[assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "log4net", Watch = true)]
// This will cause log4net to look for a configuration file
// called TestApp.exe.log4net in the application base
// directory (i.e. the directory containing TestApp.exe)
// The config file will be watched for changes.

So ,do i need to create a file with .log4net extension ,if so i tried and its not working.
And not working from my web.config also.

Please see my web.config code

<log4net debug="true">
<appender name="EventLogAppender" type="log4net.Appender.EventLogAppender">
<param name="LogName" value="PortalWebLog" />
<param name="ApplicationName" value="Portal" />
<eventId value="6" />
<eventCategory value="10" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property

{NDC}

] - %message%newline" />
</layout>
</appender>
<root>
<priority value="DEBUG" />

<appender-ref ref="EventLogAppender" />
</root>
</log4net>

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

And the dll method ,where i am accesing the log

log4net.Config.XmlConfigurator.Configure();
log4net.ThreadContext.Properties["EventID"] = 6;

String tempdata=string.Empty;

if (!System.Diagnostics.EventLog.SourceExists(sourceName))

{ tempdata = sourceName + logName + objErr + strBotListPath; System.Diagnostics.EventLog.CreateEventSource(sourceName, logName); }

else
{
if (log.IsDebugEnabled)

{ log.Debug("This is a DEBUG level message. The most VERBOSE level."); log.Info("Extended information, with higher importance than the Debug call"); log.Warn("An unexpected but recoverable situation occurred"); tempdata = "Source already exits"; }

else

{ tempdata = "Source already exits,but debug not enabled"; }

}

The output is

Source already exits,but debug not enabled

it works fine while doing in Global.asax file,but these issues are only accessing the external dll. So my questiona are in assembly.cs like where the .log4net config file should be placed?.Or am i doing anything wrong in the config part...

Please give me some input...

Thanks

*UPDATE*
After removing the below line

[assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "log4net", Watch = true)]

and changing the line,by placing the log4net.config in C:\windows\system32\inetsrv,the error log is enabled.*But i am not seeing any errors in the eventLog its empty*

log4net.Config.XmlConfigurator.ConfigureAndWatch(new FileInfo(AppDomain.CurrentDomain.SetupInformation.ApplicationBase+"log4net.config"));