Threading C#

Question

Hi, I am a beginner to .Net Compact Framework programming, I am developing a windows mobile 6 application and need some help with Threading. My Question:, is How to start a Timer on a a form when a form is instanciated and run on a separate thread and also be able to stop the thread when the form is not in use. Since .Net Compact Framework is limited to a certain extent. Any Help will be greatly appreciated. Thanks.