Windows.Forms.Timer OR System.Threading.Timer

I have an application that runs many threads. Each thread should have a timer that checks for something in that thread's scope. My question is: Which timer I should use and what is the difference between them?

What is System threading timer?

System. Threading. Timer, which executes a single callback method on a thread pool thread at regular intervals. The callback method is defined when the timer is instantiated and cannot be changed.

Does System timers timer run in a separate thread?

Yes, they run in a different thread.

Is System threading timer thread safe?

Timer is not thread-safe.

This article provides an excellent comparison and should contain the information you need: Comparing the Timer Classes in the .NET Framework Class Library:

Windows.Forms System.Timers System.Threading Timer event runs on what thread? UI thread UI or worker thread Worker thread Instances are thread safe? No Yes No Familiar/intuitive object model? Yes Yes No Requires Windows Forms? Yes No No Metronome-quality beat? No Yes* Yes* Timer event supports state object? No No Yes Initial timer event schedulable? No No Yes Class supports inheritance? Yes Yes No

* Depending on the availability of system resources (for example, worker threads)