C# と VB.NET の質問掲示板

すみません。
student[0]の.以降の部分が
保護水準の問題でエラーが発生します。
図表モードでもう一度書きます。
どうぞよろしくお願いします。

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

namespace ConsoleApplication4
{
class Program
{
class Pro
{
int num; //番号
char name; //名前
int language; //国語
int math; //数学
int science; //理科
int society; //社会
int eng; //英語
int total; //合計点
int avg; //平均点


public Pro()
{
}
}

class St:Pro
{
public static void Main(string[] args)
{
//struct grade data[3];
//grade [] data=new grade[3];

Pro [] student = new Pro[6];
int temp;
//int[] student = new int[6];

//struct SEISEKI student[6]; //成績表
//struct SEISEKI temp; //臨時変数

//学生の成績入力する。

student[0].num = 1;
student[0].name = 'A';
student[0].language = 65;
student[0].math = 71;
student[0].science = 74;
student[0].society = 82;
student[0].eng = 97;
student[0].total = 0;
student[0].avg = 0;

student[1].num = 2;
student[1].name = 'B';
student[1].language = 84;
student[1].math = 83;
student[1].science = 74;
student[1].society = 64;
student[1].eng = 65;
student[1].total = 0;
student[1].avg = 0;

student[2].num = 3;
student[2].name = 'C';
student[2].language = 74;
student[2].math = 74;
student[2].science = 78;
student[2].society = 80;
student[2].eng = 78;
student[2].total = 0;
student[2].avg = 0;

student[3].num = 4;
student[3].name = 'D';
student[3].language = 90;
student[3].math = 90;
student[3].science = 90;
student[3].society = 90;
student[3].eng = 90;
student[3].total = 0;
student[3].avg = 0;

student[4].num = 5;
student[4].name = 'E';
student[4].language = 87;
student[4].math = 78;
student[4].science = 85;
student[4].society = 60;
student[4].eng = 88;
student[4].total = 0;
student[4].avg = 0;

student[5].num = 6;
student[5].name = 'F';
student[5].language = 93;
student[5].math = 95;
student[5].science = 94;
student[5].society = 92;
student[5].eng = 95;
student[5].total = 0;
student[5].avg = 0;



int sum = 0;
for (int i = 0; i < 6; i++)
{

sum = sum + student[i].language;
sum = sum + student[i].math;
sum = sum + student[i].science;
sum = sum + student[i].society;
sum = sum + student[i].eng;

student[i].total = sum;
student[i].avg = sum / 5;

sum = 0;
}

Console.WriteLine("問題１ 合計点と平均点を求める");
Console.WriteLine("番号　名前　国語　数学　理科　社会　英語　合計点　平均点");

for (int i = 0; i < 6; i++)
{
Console.WriteLine("{0},{1},{2},{3},{4},{5},{6},{7},{8}", student[i].num, student[i].name, student[i].language, student[i].math, student[i].science, student[i].society, student[i].eng, student[i].total, student[i].avg);
}

//test2
for (int j = 0; j < 6; j++)
{
for (int k = 0; k < 6; k++)
{
if (student[j].avg < student[k].avg)
{
temp = student[j];
student[j] = student[k];
student[k] = temp;
}
}
}

Console.WriteLine();
Console.WriteLine("問題2 平均点で昇順");
Console.WriteLine("番号　名前　国語　数学　理科　社会　英語　合計点　平均点");
for (int i = 0; i < 6; i++)
{
Console.WriteLine("{0},{1},{2},{3},{4},{5},{6},{7},{8}", student[i].num, student[i].name, student[i].language, student[i].math, student[i].science, student[i].society, student[i].eng, student[i].total, student[i].avg);
}

//test3
for (int j = 0; j < 6; j++)
{
for (int k = 0; k < 6; k++)
{
if (student[j].eng > student[k].eng)
{
temp = student[j];
student[j] = student[k];
student[k] = temp;
}
}
}


Console.WriteLine("問題3 英語点で降側");
Console.WriteLine("番号　名前　国語　数学　理科　社会　英語　合計点　平均点");
for (int i = 0; i < 6; i++)
{
Console.WriteLine("{0},{1},{2},{3},{4},{5},{6},{7},{8}", student[i].num, student[i].name, student[i].language, student[i].math, student[i].science, student[i].society, student[i].eng, student[i].total, student[i].avg);
}

}
}
}
}