When you use a DispatcherTimer object, it represents a timer that is bound to the UI thread. The Interval property of the DispatcherTimer class indicates the period of the timer for the Tick event to raise, and continues ticking until explicitly stopped.
To start the timer, you can call its Start() method, or set the IsEnabled property to true. Similarly, to stop a timer, you can call the Stop() method, or set the IsEnabled property to false.
Never perform any lengthy operations in the Tick event, as it runs on the UI thread. Long running operations may block the UI from responding.