Timers
The System.Windows.Threading.DispatcherTimer dispatch timer is used when you only want a single event. It fires of an event, and DOES NOT create a new thread. However, this means that the timer function will not run while other code in the  same thread is executing.
The System.Timers.Timer timer creates a new thread for the timer expired event. This can be a useful way of creating a multi-threaded application without going into the hassle of creating the thread yourself.
// Timer is used for main control loopprivate System.Timers.Timer _timer;
public void SetupTimer() {    // Create a new timer    _timer = new System.Timers.Timer();    _timer.Elapsed += new System.Timers.ElapsedEventHandler(Timer_Run);    _timer.Interval = 100;    // This is so the thread is only run once at a time,    // timer is restarted in event handler.    _timer.AutoReset = false;}
public void Timer_Run() {    // Code to run when timer expires. This code    // will be run in a seperate thread to the one which    // called SetupTimer()
    // Code here
    // Start the timer again, as AutoReset = false    // _timer.Start();}