二分法 c#

//0~999 猜价格
            Console.WriteLine("请输入商品价格：");
            int commoditPrices =Convert.ToInt16( Console.ReadLine());
            Console.WriteLine("参与者:");
            int prices=Convert.ToInt16( Console.ReadLine());
            int i=1;
            while (true)
            {
                i++;
               if (prices<commoditPrices)
               {
                   Console.WriteLine("低了");
                   Console.WriteLine("参与者:");
                   prices = Convert.ToInt16(Console.ReadLine());
               }
               else if (prices>commoditPrices)
               {
                    Console.WriteLine("高了");
                   Console.WriteLine("参与者:");
                   prices = Convert.ToInt16(Console.ReadLine());
               }
               else
               {
                   Console.WriteLine("恭喜你，猜对了，总共猜了{0}次。",i);
                   break;
               }

            }

            Console.ReadKey();