Выход из консоли по кнопке Q 

Свойство Console.KeyAvailable

static void Main(string[] args)
 {
  ConsoleKeyInfo cki = new ConsoleKeyInfo();
  do
  {
   while (Console.KeyAvailable == false)
   Thread.Sleep(250);
   cki = Console.ReadKey(true);
  }
  while (cki.Key != ConsoleKey.Q);
 }

https://msdn.microsoft.com/ru-ru/library/system.console.keyavailable(v=vs.110).aspx

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