learningmrs says:
In Chrome Brower- User-A Logged in and using the Web application
in the same browser - if User -B tries to log in i want to restrict them to Login in and show message already some User logged in. Please logout and Try login
How is it possible for two users to use same machine and same browser?
Also did what type of Login mechanism you are using?
If you are using Cookie based Forms Authentication. It is impossible unless and until person logs out and again logs in.