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Refer below link.

Prevent multiple browser Windows or Tabs from sharing the same Session in ASP.Net

 

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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.

Simple Form based authentication example in ASP.Net

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Its pretty easy you need to implement this in your login method 1. take user name & password and check if authentication is already true for any user 2. .Then match username and the current supplied username if not same then raise message Please logout and try login 3. If same user tries login twice just redirect to the default pge.

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bilalrcc says:

Its pretty easy you need to implement this in your login method
1. take user name & password and check if authentication is already true for any user
2. .Then match username and the current supplied username if not same then raise message Please logout and try login
3. If same user tries login twice just redirect to the default pge.

Unless and until user logs out and other user can't login.

You need to check if already one user loggedin then redirect user to home page where user logout from the application and redirect to login page.

All these functionality implemented in the below article.

Please refer the article.

Simple Form based authentication example in ASP.Net