CheckStateChanged（复选框选中状态更改事件）和 CheckedChanged(单选按钮选中状态更改事件)二者区别？

CheckStateChanged（复选框选中状态更改事件）和 CheckedChanged(单选按钮选中状态更改事件)二者区别:

复选框控件(CheckBox)提供了CheckedChanged控件的选择状态发生改变；双击即可进入CheckedChanged编辑界面，此按钮未提供CheckStateChanged事件。

单选按钮控件（RadioButton）提供了CheckStateChanged选中状态被更改，双击单选按钮，可进入CheckedChanged编辑界面。

using System;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace Test18
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void checkBox1_CheckStateChanged(object sender, EventArgs e)
        {
            MessageBox.Show("控件的选择状态发生改变");
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {

        }
    }
}

using System;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace Test20
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            MessageBox.Show("RadioButton1控件的选中状态被更改");
        }
        private void button1_Click(object sender, EventArgs e)
        {
            radioButton1.Checked = true;
        }
        private void button2_Click(object sender, EventArgs e)
        {
            radioButton1.Checked = false;
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            radioButton1.Checked = true;
        }
    }
}