I am using VB.Net delveloping Web base application (Online examination). I'd like to monitor the exam in terms of the lenght of time. For example, after 25 minutes the exam will shut down automitically.

I am thinking, after the form(WebForm1.aspx) loaded, there will be a timer shows on the top of the form. Starting form 00:00, and then when it reaches 25:00, the form will automatically unload. This is 1zjust my theory, but I have no idea how to do it. Does anybody know how to do this or even has better idea.

Thank you in advance.