HOW TO IMPLEMENT AUTO LOGIN IF THE LOGIN USER ROLE IS ADMIN IN WINDOWS AUTHENTICATION IN ASP.NET

Question

Hi
I would like to implement below feature in my .net application.

Currently our login application works with Active Directory. Now, I have to change if the system user as administration then web application is not open login page, it automatically logged. if not administrator then we need to show login page. 

Can you please advise me?

Thanks in Advance