要求是输入学号,输出对应的信息
开始时建立一个 c# Windows应用程序,并添加一个新类.名为class.
内容为
using System;
using System.Collections.Generic;
using System.Text;

namespace WindowsApplication1
{
    class Student
    {
        protected int _id;
        protected string _name;
        protected string _gender;
        protected int _classes;
        protected int _grade;
        public int ID
        {
            get {return _id;}
            set {_id=value;}
        }
        public string Name
        {
            get {return _name;}
            set {_name=value;}
        }
        public string Gender
        {
            get { return _gender; }
            set { _gender = value; }
        }
        public virtual int Classes
        {
            get { return _classes; }
            set { _classes = value; }
        }
        public virtual int Grade
        {
            get { return _grade; }
            set { _grade = value; }
        }

    }
    class Undergraduate : Student
    {
        protected string _department;
        public string Department
        {
            get { return _department; }
            set { _department = value; }
        }
    }
    class Graduate : Student
    {
        protected string _tutor;
        public string Tutor
        {
            get { return _tutor; }
            set { _tutor = value; }
        }
    }
}
在form.cs中

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Student[] students = new Student[3];
[color=FFFF00]            students[0]._id = 001;
            students[0]._name = "张浩";
            students[0]._gender = "男";
            students[0]._classes = 1; 
            students[0]._grade = 2; 
        }
    }
}
下面该怎么编写.(在应用程序中的学号中输入 001 显示其他信息)