c# —— study c# label and textbox controls

    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 label练习
    {
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
    
        private void label1_Click(object sender, EventArgs e)
        {
    
        }
    
        private void textBox1_TextChanged(object sender, EventArgs e)//TextBox的事件   TextChange