public static void ShowOrderByNo(ref RestaurantManager restaurantManager)
{
Console.WriteLine("Enter the number:");
string noStr = Console.ReadLine();
int no;
while (!int.TryParse(noStr, out no) || no < 0)
{
Console.WriteLine("Error! Enter the price correctly!");
noStr = Console.ReadLine();
}
restaurantManager.GetOrderByNo(no);
}
