I am developing a website. What is the appropriate place in a application to create a session to a user.

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I am developing a website. What is the appropriate place in a application to create a session to a user.

Session management is maintained all by ASP.NET so you do not need to create sessions. Once a user visits the ASP.NET site ASP will create the session and manage it either via cookie or cookieless session. 

 declare application level session variable in global.ascx file

session level and application level variable is diffrent

 I actually want to display total number of users online.

For this i had created an application  variable  in global.asax. On session start I had incremented it by one and on session end i had decreamented it by one.

 application variable is getting increased by 1 after opening the browser.

Problem is app variable is not decreased by 1 after closing the browser. It was decreased by 1 only when session expires(depending on expire time ). But i want to decrease this app variable immediately after closing browser.

Please tell me solutions to this probem.

Thanks in advance.