file appender in web apps

[hbmlists]

Hi, 

I am using log4net 1.2.9 and .Net 1.1 

I am planning to use a file appender to log Debug messages for a web 
application. Are there any drawbacks/limitations in using file appender for  
a web app given the fact that there will be many concurrent users. Also 
ideally what should be the locking mode? Minimal or Exclusive. If Exclusive 
then when will the lock be released ? 

Also do I need to explicitly call LogManager.ShutDown() or any other methods 
in the Application_End event? 

Thanks,
Hemant