C#编程中的复选框（CheckBox）练习

    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 购物计划
    {
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
    
        float money=0;
    
        private void label1_Click(object sender, EventArgs e)
        {
    
        }
    
        private void checkBox1_CheckedChanged(object sender, EventArg