Recognize when a account login at the same time

Hi,

I've an web app that use a handler for different functions e.g. for the login.
So when a user login I create a cookie for:
Call: ../login.api?User=test&pw=test
Code behind: Session["ID"]=result_from_sql

This works fine but now I have a problem:
When one user account is active and on an other place a user try to login with the some account, the working one should be informed about.
As the login is done by the handler I've no idea how to do this.
Maybe is a way to work with Global.asax to manage it but I've never used it so is just an idea...

Has somebody a solution how to do something like this?

Thanks,

Andre
andre72Asked:
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Rahul Goel ITILSenior Consultant - DeloitteCommented:
Hey you can do it very easily. you log the session in database, what time it is logged in and from where for every login. If any same user is trying to login with same credentials whose session is active. Allow user to login but cross check with the host logged in.

And On the first user side. make a call to your applicaiton thorugh ajax and check for the consitency for the session and flash a alert message to ther user and differentiate the login time to intimate the user means whom to intimate
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