true if the thread is or is to become a background thread; otherwise, false.
Type Reason System.Threading.ThreadStateException The thread has reached the ThreadState.Stopped state.
A thread is either a background thread or a foreground thread. Background threads are identical to foreground threads, except that background threads do not prevent a process from terminating. Once all foreground threads belonging to a process have terminated, the common language runtime ends the process. Any remaining background threads are stopped and do not complete.