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。

好的，下面是完整的代码实现：

using System;
using System.Windows.Forms;

namespace experment9
{
    public partial class Form1 : Form
    {
        // 学生记录数组
        private Student[] students;

        public Form1()
        {
            InitializeComponent();

            // 初始化学生记录数组
            students = new Student[10];
            students[0] = new Student(1, "张三", 20, "男");
            students[1] = new Student(2, "李四", 21, "女");
            students[2] = new Student(3, "王五", 22, "男");
            students[3] = new Student(4, "赵六", 23, "女");
            students[4] = new Student(5, "钱七", 24, "男");
            students[5] = new Student(6, "孙八", 25, "女");
            students[6] = new Student(7, "周九", 26, "男");
            students[7] = new Student(8, "吴十", 27, "女");
            students[8] = new Student(9, "郑一", 28, "男");
            students[9] = new Student(10, "王二", 29, "女");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // 获取用户输入的学号
            int id = int.Parse(textBox1.Text);

            // 根据学号查找学生记录
            Student student = null;
            foreach (Student s in students)
            {
                if (s.Id == id)
                {
                    student = s;
                    break;
                }
            }

            // 显示学生记录
            if (student != null)
            {
                label2.Text = "姓名：" + student.Name;
                label3.Text = "年龄：" + student.Age;
                label4.Text = "性别：" + student.Gender;
            }
            else
            {
                MessageBox.Show("未找到该学生！");
            }
        }
    }

    // 学生类
    public class Student
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
        public string Gender { get; set; }

        public Student(int id, string name, int age, string gender)
        {
            Id = id;
            Name = name;
            Age = age;
            Gender = gender;
        }
    }
}

在这个实现中，我们首先在窗体的构造函数中初始化了一个包含10名学生记录的数组。然后，在单击按钮时，我们获取了用户输入的学号，并在数组中查找相应的学生记录。最后，我们将找到的学生记录显示在窗体上，或者在未找到该学生时弹出错误提示框。