How to use progressbar control and timer control to display timelimit ?

Question

Hi Programmers,
        I am intermediate level programmer in c#.
        I am making an application in using visual studio 2008 and c# as language to conduct standalone objective type exam. My requirement is as follow:

I want to use the Progress Bar control to display the time limit of the exam.
The time must be displayed in minutes and secs.
Initially i want that the Progress Bar must be completely filled and time remaining must be displayed. As the Progress Bar control decreases the time should also be displayed decreasing.

How this can be achieved? Please help me.
If you have some code that would help me achieve this task then please forward me.

Thank you.