How to not block the UI thread

DoNotBlockUIThread.cs

/* How to not block UI thread: */
public static void Main()
{
  /* Your code here */

   Task exitTask = ExitCommandAsync();
   Task.WaitAll(exitTask);
   
   /* Console remains active */
}

private static Task ExitCommandAsync()
{
    return Task.Run(() =>
    {
         while (Console.ReadLine() != ExitCommand)
         {
         }
    });
}

Task.WaitAll() is blocking UI thread, but the idea is that it can be used like:
Task.WaitAll(exitTask, mainTask, backgroundTask1, backgroundTask2 ..... );

In order to see difference replace Task.WaitAll() with Task.WhenAll()