C#链接MySQL

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;
using MySql.Data.MySqlClient;

namespace MySQLtest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            string strcn = "Server=127.0.0.1;User ID=root;Password=mysql;Database=student;CharSet=gbk;";
            MySqlConnection cn = new MySqlConnection(strcn);//实例化链接
            cn.Open();//开启连接

            MySqlCommand cmd = cn.CreateCommand();
            /************************************************
            cmd.CommandText = "insert stu (sno,sname,sclass) values(‘20161‘,‘tt‘,‘class1‘)";//SQL插入数据
            cmd.CommandText = "insert stu values(‘20162‘,‘ll‘,‘class3‘)";
            cmd.CommandText = "delete from stu";//删除数据
            cmd.CommandText = "delete from stu where sname=‘ll‘";
            cmd.CommandText = "update stu set sclass=‘class2‘ where sclass=‘class3‘";//修改数据
            ************************************************/
            cmd.CommandType = CommandType.Text;
            int i = cmd.ExecuteNonQuery();

            cn.Close();//关闭连接

        }
    }
}