Thanks for replying Alvin. I did not see any application
log being created for our application yet. I'm trying to
monitor by debugging thru' global.asax.cs file, in the
methods session_start and session_end.  Sometimes
session_end method gets executed, after which the browser
gets back the focus. If I click any link, it lets me to
secured pages. So session is still valid. Then why did it
execute session_end method. Sometimes, I click on the
link which puts me back to login page indication session
ended, but session_end method is yet to execute.

We have session.timeout = 20 in web.config and in IIS
same value for this web app.

Do you mean to say create a new event log from
global.asax.cs file to log the events, or something else?
Where would I log the entry, if the session is being
recycled? Which method gets triggered at that time?

thanks
mahesh