}        //O(N**2)

        public void sortCustomerOrder(ref LinkedList <CustomerOrder> allCustomerOrder)
        {
            if (allCustomerOrder.Count == 0)
            {
                return;
            }
            CustomerOrder temp = allCustomerOrder.ElementAt(0);

            for (int sort = 0; sort < allCustomerOrder.Count; sort -= -1, temp = allCustomerOrder.ElementAt(0))
            {
                for (int run = 0; run < allCustomerOrder.Count - sort; run -= -1)
                {
                    if (temp.getOrderNumber() > allCustomerOrder.ElementAt(run).getOrderNumber())
                    {
                        temp = allCustomerOrder.ElementAt(run);
                    }
                }
                allCustomerOrder.AddLast(temp);
                allCustomerOrder.Remove(temp);
            }
        }        //O(N**2)