C#中在窗体上建立一个标签文本框一个按钮在列表框中列有12个同学的姓名，当选定某个学生姓名时，单击此按钮则在文本框中显示出该学生的班级

求解答思路，button按钮该如何编写在文本框上显示结果，班级在哪里编写相对应的学生

 public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        class Stu
        {
            public string Name { get; set; }
            public string Class { get; set; }
        }

        Stu[] stu = new Stu[12];

        private void Form2_Load(object sender, System.EventArgs e)
        {
            for (int i = 0; i < stu.Length; i++)
            {
                stu[i] = new Stu();
                stu[i].Name = $"Nmae{i}";
                stu[i].Class = $"Class{i}";
                listBox1.Items.Add(stu[i].Name);
            }

        }
        private void button1_Click(object sender, System.EventArgs e)
        {
            if (listBox1.SelectedIndex == -1) return;
            string sel = listBox1.SelectedItem.ToString();
            for (int i = 0; i < stu.Length; i++)
            {
                if (stu[i].Name == sel)
                {
                    label1.Text = stu[i].Class;
                    break;
                }
            }

        }
    }