session_end and prevent double username log on
i have an asp.net application which will limit for an example 10 users to log in at 1 time ( to control network traffic purpose).
The 11th user who wanna log on have to hold on until the 1 of the first 10 users log out, the 11th user then will be able to log on to the website.
So i need to detect numbers of active users who access my website.
This is my coding for this event:
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
' Fires when the session is started
Application("UserCount")+ = 1
Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
' Fires when the session ends
Application("UserCount") -= 1
In my logout page:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
The session.abandon will event session_end immediately if i logout with a proper way by clicking logout button and this will trigger application("usercount") -=1. However, Application("Usercount") -=1 will be trigger again after 5 minus which is the timeout set in web config for the session. So for example two users log in and i will get -2 for my 'application("usercount")' after all the two users log out.
May i know why this happen? Or if there is any alternate way to get the same output? Please help.
Besides that, is there a way to detect double usernames log on, which mean the same username is log on using the different machine on the same time?
The problem is the session on end event is not reliable. It will not fire immediatly after a session ends. Also the session state is a bit unreliable. You would be better off setting this up from iis.
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