How to restricted only one user login in Asp.net

Have a look at the below links:

http://www.nullskull.com/articles/20030416.asp

http://www.nullskull.com/articles/20030418.asp

When user direct close the browser then how it can be update to 0

Hi friends

create one field in login table like status when user login status set 1 when logout set 0.

kow you can restrict user login when user already loged in then check status if status is 1 then popup message.

www.sqlneed.blogspot.com

https://youtu.be/mof97thsmzs