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_WIN13 {14     public partial class Form1 : Form15     {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