已经自己更改好了，嘿嘿。

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

namespace projGetMaxScore
{
    class Program
    {
        static void Main(string[] args)
        {
            //声明string数组。
            string[,] S = new string[8, 2] { { "吴松", "89" }, { "钱东宇", "90" }, { "伏晨", "98" }, { "陈陆", "56" }, { "周蕊", "60" }, { "林日鹏", "91" }, { "何昆", "93" }, { "关欣", "85" } };
            //声明缓存数组。
            string[] C = new string[2];
            //for循环.
            for (int i = 0; i < S.GetLongLength(0); i++)
            {
                //缓存数组与string数组元素转换为int型.
                int a = Convert.ToInt32(C[1]);
                int b = Convert.ToInt32(S[i,1]);
                //与缓存数组循环比较大小.
                if (a < b)
                {
                    //最大值赋值给缓存数组。
                    C[0] = S[i, 0];
                    //赋值前转换回string.
                    C[1] = Convert.ToString(a);
                    S[i, 1] = Convert.ToString(b);
                    C[1] = S[i, 1];
                }
                else
                    continue;
            }
                //输出
                   Console.Write("分数最高的是" + C[0] +","+ "分数是" + C[1]);
        }
    }
}

我写得好像有点太冗余了。