c#九九乘法表While循环

 using System;
using System.Collections.Generic;
using System.Text;

namespace 九九乘法表
{
    class Program
    {
        static void Main(string[] args)
        {

            int  i=1, j=1,sum =1;
            do
            {
                sum = i * j;
                Console.Write("{0}*{1}={2}  ", i, j, sum);
                i++;
                if (i > j)
                {
                    Console.WriteLine();
                    j++;
                    i = 1;
                }

            } while (j <= 9);