Thank to all for replying on this post.
But I have solved this problem.
I have added Iframe and created another page, which fires a trigger after every 1 min on database. It checks time and registers a Client Script popup on browser.
No hole page PostBacking, no any JQuery & no any third party utility.
Job done
Thank to all once again.
Please find sample code at below link.
IFrameTimer.zip[
^]
Thank You