Timer or Watcher for function result

[GooG2e]

Hello!
I have some value in process memory (not my process).
I have address of this value and want to execute function or smth else on changing this value.
I think to use timers but I think they are too slow - low resolution(I read smth from 10 to 50 ms) and uses CPU too much.
Can you offer me some other solution with not very much cpu usage but with checking variable value nearly 1 to 5 ms.
Thank you.

[.Net Fan]

You can do it in Threads. Create a void parameterless method

         private void MyFunction()
        {
            
            while (yourValueIsNotGood)
            {
                Thread.Sleep(5);
            }

            // here your value is good
            // do your action which you need
        }

Then call the method in thread

            System.Threading.Thread thread = new System.Threading.Thread(MyFunction);
            thread.Start();
            thread.Join();

            // you come here when you exit MyFunction() (i.e. your value is good)