public static void ShowOrderByDateInterval(ref RestaurantManager restaurantManager) { Console.WriteLine("Enter first date"); DateTime datefirstTime = Convert.ToDateTime(Console.ReadLine()); restaurantManager.GetOrderByDate(datefirstTime); Console.WriteLine("Enter second date"); DateTime datesecondTime = Convert.ToDateTime(Console.ReadLine()); restaurantManager.GetOrderByDate(datefirstTime); restaurantManager.GetOrdersByDatesInterval(datefirstTime, datesecondTime); }