99乘法表打印

前几天听到同事说现在要他写个九九乘法表估计都不会写，我也心想这个没那么难吧，所以今天没事就写了一下发现很容易吗

 private void chengfa(int rows)
        {
            for (int i = 1; i <= rows; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write(string.Format("{0}*{1}={2} ", j, i, j * i));
                }
                Console.WriteLine("\n");
            }
            Console.ReadLine();
        }