datagridview 中添加了一个button类型的列,怎么写button的事件

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Windows.Forms;
 9 using System.Data.Sql;
10 using System.Data.SqlClient;
11 
12 namespace DGV_ButtonEvent_WIN
13 {
14     public partial class Form1 : Form
15     {
16         DataSet ds = new DataSet();
17         DataTable dtInfo = new DataTable();
18         string strConn = "Server=.;Trusted_Connection=SSPI;Database=DBTRUCK;Enlist=false;";   
19 
20         public Form1()
21         {
22             InitializeComponent();
23         }
24 
25         private void Form1_Load(object sender, EventArgs e)
26         {
27             SqlConnection conn = new SqlConnection(strConn);
28             conn.Open();
29             string strSql = "SELECT * FROM CarFee";
30             SqlDataAdapter sda = new SqlDataAdapter(strSql, conn);
31             sda.Fill(ds, "ds");
32             conn.Close();
33             dataGridView1.DataSource=ds.Tables[0];
34         }
35 
36         //dataGridView1事件
37         private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
38         {
39             if (e.RowIndex >= 0)
40             {
41                 DataGridViewColumn column = dataGridView1.Columns[e.ColumnIndex];
42                 if (column is DataGridViewButtonColumn)
43                 {
44                     //这里可以编写你需要的任意关于按钮事件的操作~
45                     MessageBox.Show("按钮被点击");
46                 }
47         　　　　　//DGV下拉框的取值
48                 MessageBox.Show(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex-1].Value.ToString());
49             }
50         }
51     }
52 }
53  
54