我学过JAVA，JAVA的这道题差不多也是这样做的

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

namespace 第三部分作业
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 1; i < 10; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write("{0}*{1}={2}",i,j,(i*j));
                    Console.Write(" ");
                }
                Console.WriteLine();
            }
            Console.ReadLine();
        }
    }
}

 Console.Write("{0}*{1}={0*1}",i,j);因该是{2}然后是i*j;内重循环的条件是j<=i;