Global timer for specific time duration in asp.net 3.5 c#

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ASP.NET

C#3.5

i m working on a web application on visual studio 2010 framework 3.5. this application has five forms in individual pages.To fill the form user need to create a project and there he sets time minimum 20 minute ahead of current date and time. Time is in Utc Format. if in 20 minutes, applicant is not able to fill all the forms, then since last 4 minute applicant should be acknowledged with remaining time using a popup, if he wish he can set time by click on ok script and will be redirected to the page, if applicant does not set the time then in last 30 seconds page should automatically be redirected to the page where time set option is available.

What I have tried:

check what forms are remaining to complete.

compare the set time with current date and time
but i m stuck to raise the alert message and redirect to the very first page.
please help me