how to prevent another user from login if one user is access

Question

how to prevent another user from login if one user is accessing the application. Forex- Kriss is accessing the application at the same time Ganesh want to access the same application then he will not be able to access the application. please give me some idea or give me the reference to solve this problem.

Rahul Kaushik · Answer

There is a perfect way while using flag to detect whether someone is already logged in or not and in case if System get power off  you need an event handler called as SystemEvents.SessionEnds. Use this to change the flag value from true to false Use this link as a reference https://stackoverflow.com/questions/6799955/how-to-detect-windows-shutdown-or-logoff

Mann Maurya · Answer

Hey Ajeesh one more question... ?? If power off happen then how you suppose to Reset the flag

Ajeesh · Answer

You can take a look at this article which discuss a similar topic. https://blog.learningtree.com/preventing-duplicate-logins-in-asp-net/ Another option would be to have a flag in your table and set the value to true when an user login and when user log off set the value to false. Also for when a second user tries to login we will first check if login flag has been set to true for any other user. If its true then show message to user and display the login page if not allow the user to login.