If I use a System.Windows.Forms.Timer I can stop or start the timer with:

System.Windows.Forms.Timer tmrCheckStuff = new System.Windows.Forms.Timer();
this.tmrCheckStuff.Interval = 4000; // about 4 seconds
this.tmrCheckStuff.Start;
or
this.tmrCheckStuff.Enabled = true;

If I need to stop if for a moment while something else occurs, then restart it that is pretty easy. But if I use a Threading.Timer, how do I do this?
I can issue a tmrCheckStuff.Change()

AutoResetEvent autoEvent = new AutoResetEvent(false);
TimerCallback timerDelegate = new TimerCallback(MyStuffClass.DoStuffMethod);
private System.Threading.Timer tmrCheckStuff = new System.Threading.Timer(timerDelegate, autoEvent, 90000, 5000);

I can change the time with:
autoEvent.WaitOne(5000, false);
tmrCheckStuff.Change(0, 9000);

Is there a simple way to just start and stop this timer?
Also, with the Callback how do I call a method in the same class as the timer is declared? the DoStuffMethod().
Thanks
Tim