c#读取MySQL数据表中的内容

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//引入MySQL
using MySql.Data.MySqlClient;
using System.Data.SqlClient;
using System.Data.OleDb;

namespace c_01_连接查询MySQL数据库
{
    public partial class frmQuery : Form
    {
        public frmQuery()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MySqlConnection sqlCnn = new MySqlConnection();
            sqlCnn.ConnectionString = "server = '127.0.0.1'; uid = 'root'; pwd = 'root'; database = 'ajax_stydy';";//连接字符串
            MySqlCommand sqlCmd = new MySqlCommand();
            sqlCmd.Connection = sqlCnn;
            sqlCmd.CommandText = "select * from user";
            try
            {
                sqlCnn.Open();
                MySqlDataReader rec = sqlCmd.ExecuteReader();
                textBox2.AppendText("数据库连接成功！\n");
                textBox1.AppendText(string.Format("ID\t 用户名\t 密码\t\n"));
                while (rec.Read())
                {
                    textBox1.AppendText(string.Format("{0}\t {1}\t {2}\t\n", rec.GetInt32(0), rec.GetString(1), rec.GetString(2)));
                }
                textBox2.AppendText("读取数据完成！\n");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "error");
            }
            finally
            {
                textBox2.AppendText("数据库连接关闭！");
                sqlCnn.Close();
            }
        }
    }
}

数据库字段：