A thread is defined as the execution path of a program. Each thread defines a unique flow of control
When the foreground threads will close, the background threads will be terminated.
The property used for background thread is IsBackground that gets or sets a value indicating whether a thread is a background thread. The default value of this property would be false because the default threads created are Foreground Threads.
To create a background thread −
Thread bgThread = new Thread(tStart); bgThread.IsBackground = true; bgThread.Start();
Foreground threads continue to run until the last foreground thread is terminated.
When all the foreground threads are stopped, the application is closed. The default threads that are created are foreground threads.