Session variables issue

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C#

ASP.NET

Windows

IIS

Win2008-R2

, +

Dear experts,

I have come across this may be stupid issue which I want someone else to shed some light on.

I have a web page (say default.aspx - ASP.Net / C#)

When this page loads, it does the following activity;

1. It grabs the windows user name from client's machine (because it is single sign on application)
2. Queries the database with the windows user name and then brings back all other credentials
3. Creates session variables for username, position... etc as per values from step 2 above
4. It then checks whether the user is acting as a PA for any other user by querying the database
5. If Yes, it then grabs all the people for whom they are acting as a PA and the creates tag for each manager
6. It then display the page
7. The last option would be the user itself which is hard coded in the page to go to the dashboard page

If the user clicks as to login as themselves, they go the dashboard page straight
If the user clicks on any manager, it then grabs all manager credentials and replaces the session variables with the one of managers and goes to the dashboard page

The issue is when the user login as themselves, the session previously established in step 3 above dis-appears and error occurs.

Please advice to resolve this if possible.

Thanks.

Nayan