Maximum queued elements in ThreadPool.QueueUserWorkItem

Question

I set the max thread to 10. Then I added 22000 task using ThreadPool.QueueUserWorkItem. It is very likely that not all the 22000 task was completed after running the program

Answer 1

From the documentation of ThreadPool:

Note: The threads in the managed thread pool are background threads. That is, their IsBackground properties are true. This means that a ThreadPool thread will not keep an application running after all foreground threads have exited.

Is it possible that you're exiting before all tasks have been processed?