When does a multithreaded console application exit?

Question

class Program
{
    public static void Main(String[] args)
    {
        var c = new C();
        var thread = new Thread(new ThreadStart(c.F));
        thread.Start         


        

Answer 1

A process ends when all foreground threads terminate

From Thread.IsBackground remarks on foreground threads vs background threads:

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.