Pause and Resume timer

Question

Hi

 

I am a Fresher, am creating a windows application in which i have two forms.

In first form i created a button(Named as Break) and timer which will start on load.

when he clicks on Break button he will be redirected to a login page.

As soon as he clicks on the Break button the timer should pause.

and when the person login's , he will be back on first form, now the suspended timer should resume.

I am creating this app to count the no of working hours  user worked a day.

Please Help!!

Thank you,