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？

 1 using System; 2 using System.Data; 3 using System.Drawing; 4 using System.Text; 5 using System.Windows.Forms; 6 namespace Test18 7 { 8     public partial class Form1 : Form 9     {10         public Form1()11         {12             InitializeComponent();13         }14         PRivate void checkBox1_CheckStateChanged(object sender, EventArgs e)15         {16             MessageBox.Show("控件的选择状态发生改变");17         }18 19         private void Form1_Load(object sender, EventArgs e)20         {21 22         }23 24         private void checkBox1_CheckedChanged(object sender, EventArgs e)25         {26 27         }28     }29 }

 1 using System; 2 using System.Data; 3 using System.Drawing; 4 using System.Text; 5 using System.Windows.Forms; 6 namespace Test20 7 { 8     public partial class Form1 : Form 9     {10         public Form1()11         {12             InitializeComponent();13         }14         private void radioButton1_CheckedChanged(object sender, EventArgs e)15         {16             MessageBox.Show("RadioButton1控件的选中状态被更改");17         }18         private void button1_Click(object sender, EventArgs e)19         {20             radioButton1.Checked = true;21         }22         private void button2_Click(object sender, EventArgs e)23         {24             radioButton1.Checked = false;25         }26         private void Form1_Load(object sender, EventArgs e)27         {28             radioButton1.Checked = true;29         }30     }31 }