Re authentication and create session without going through the login page

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VB

ASP.NET

C#5.0

Hello everyone, I have this scenario:

1. A user login successfully; hence, they are authenticated, session variable is created and user email and password are stored in the cookies

2. The user is now using the site and they are on ~/product/myexample.aspx, which requires authentication to access

3. The user filled in the form on this page but did not submit to the server

4. The user left the computer idle for 30 minutes and came back to continue working on the form

5. By now, the session has timeout and user no longer authenticated.

6. When the user clicked submit button, I would love to re authenticate and create session variable using the cookies and submit all the data on this page without losing the information the user has filled in

I found some article using jquery to keep the session alive ( http://www.dotnetcurry.com/showarticle.aspx?ID=453 ) hence keeping the user authenticated. However, it doesn't work on mobile devices since those devices go to sleep after some times. Moreover, I also found that there are issues with the application pool idle time out, which cause the users to be redirected to login page.

Would appreciate it if you could shed some light.

thanks.