Using timers and DateTime.Now

i was confused with the square brackets a moment there but I've got it now, thanks!

Can anyone tell me about using timers? This is all I could find in relation to windows phone >http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatchertimer.tick%28v=vs.95%29.aspx

Whenever I type in "DispatcherTimer" I get an error.