创建Windows窗体应用程序项目experment9，向其中添加一个窗体 Forml；用一个学生纳数组存放10名学生的记录，然后根据用户指定的学号显示相应的学生记录。

以下是实现步骤及代码示例：

1. 在 Visual Studio 中创建 Windows 窗体应用程序项目 experment9，向其中添加一个窗体 Form1。

2. 在 Form1 中添加以下控件：

- Label 控件 Label1，用于显示“请输入学号：”的提示信息。
- TextBox 控件 TextBox1，用于用户输入学号。
- Button 控件 Button1，用于触发查询学生记录的操作。
- DataGridView 控件 DataGridView1，用于显示学生记录。

3. 在 Form1.cs 文件中定义一个学生类 Student，包含以下属性：

- 学号（ID）：string 类型。
- 姓名（Name）：string 类型。
- 年龄（Age）：int 类型。
- 性别（Gender）：string 类型。

public class Student
{
    public string ID { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public string Gender { get; set; }
}

4. 在 Form1.cs 文件中定义一个学生数组 students，包含10名学生的记录，用于模拟学生信息数据。

private Student[] students = new Student[]
{
    new Student() { ID = "001", Name = "张三", Age = 18, Gender = "男" },
    new Student() { ID = "002", Name = "李四", Age = 19, Gender = "女" },
    new Student() { ID = "003", Name = "王五", Age = 20, Gender = "男" },
    new Student() { ID = "004", Name = "赵六", Age = 21, Gender = "女" },
    new Student() { ID = "005", Name = "钱七", Age = 22, Gender = "男" },
    new Student() { ID = "006", Name = "孙八", Age = 23, Gender = "女" },
    new Student() { ID = "007", Name = "周九", Age = 24, Gender = "男" },
    new Student() { ID = "008", Name = "吴十", Age = 25, Gender = "女" },
    new Student() { ID = "009", Name = "郑十一", Age = 26, Gender = "男" },
    new Student() { ID = "010", Name = "冯十二", Age = 27, Gender = "女" },
};

5. 在 Form1.cs 文件中定义一个方法 ShowStudent，用于根据用户输入的学号显示相应的学生记录。

private void ShowStudent(string id)
{
    var student = students.FirstOrDefault(s => s.ID == id);
    if (student != null)
    {
        DataGridView1.DataSource = new List<Student>() { student };
    }
    else
    {
        MessageBox.Show("未找到该学生记录！");
    }
}

6. 在 Button1 的 Click 事件中调用 ShowStudent 方法，并将用户输入的学号作为参数传入。

private void Button1_Click(object sender, EventArgs e)
{
    string id = TextBox1.Text.Trim();
    if (!string.IsNullOrEmpty(id))
    {
        ShowStudent(id);
    }
    else
    {
        MessageBox.Show("请输入学号！");
    }
}

7. 运行程序，输入学号，点击“查询”按钮，即可显示相应的学生记录。

完整代码示例：

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

namespace experment9
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public class Student
        {
            public string ID { get; set; }
            public string Name { get; set; }
            public int Age { get; set; }
            public string Gender { get; set; }
        }

        private Student[] students = new Student[]
        {
            new Student() { ID = "001", Name = "张三", Age = 18, Gender = "男" },
            new Student() { ID = "002", Name = "李四", Age = 19, Gender = "女" },
            new Student() { ID = "003", Name = "王五", Age = 20, Gender = "男" },
            new Student() { ID = "004", Name = "赵六", Age = 21, Gender = "女" },
            new Student() { ID = "005", Name = "钱七", Age = 22, Gender = "男" },
            new Student() { ID = "006", Name = "孙八", Age = 23, Gender = "女" },
            new Student() { ID = "007", Name = "周九", Age = 24, Gender = "男" },
            new Student() { ID = "008", Name = "吴十", Age = 25, Gender = "女" },
            new Student() { ID = "009", Name = "郑十一", Age = 26, Gender = "男" },
            new Student() { ID = "010", Name = "冯十二", Age = 27, Gender = "女" },
        };

        private void ShowStudent(string id)
        {
            var student = students.FirstOrDefault(s => s.ID == id);
            if (student != null)
            {
                DataGridView1.DataSource = new List<Student>() { student };
            }
            else
            {
                MessageBox.Show("未找到该学生记录！");
            }
        }

        private void Button1_Click(object sender, EventArgs e)
        {
            string id = TextBox1.Text.Trim();
            if (!string.IsNullOrEmpty(id))
            {
                ShowStudent(id);
            }
            else
            {
                MessageBox.Show("请输入学号！");
            }
        }
    }
}