สอบถามมือใหม่ครับผม อยากดึงข้อมูลในดาต้าเบส มาแสดงใน Datagridview ครับ ทำตามตัวอย่างมันไม่ขึ้น

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 WindowsFormsApplication1
{
    public partial class frmHome : Form
    {
        public frmHome()
        {
            InitializeComponent();
        }

        private void frmHome_Load(object sender, EventArgs e)
        {
            BindDataGrid();
        }

        private void BindDataGrid()
        {
            DataTable dt = new DataTable();
            string myConnection = "datasource=localhost;port=3306;username=root;password=1234;database=aprdb;";
            MySqlConnection myConn = new MySqlConnection(myConnection);
            MySqlDataAdapter myDataAdapter = new MySqlDataAdapter();
            myConn.Open();
            /*myDataAdapter.SelectCommand = new MySqlCommand("select * from table;", myConn);
            MySqlCommandBuilder cb = new MySqlCommandBuilder(myDataAdapter);*/

            MySqlCommand myCommand = myConn.CreateCommand();
            myCommand.CommandText = "SELECT * FROM table;";
            myCommand.CommandType = CommandType.Text;

            myDataAdapter = new MySqlDataAdapter(myCommand);
            myDataAdapter.Fill(dt);

            //DataSet ds = new DataSet();
            //MessageBox.Show("Connected");
            myConn.Close();


            this.dgName.DataSource = dt;

            this.dgName.Columns.Clear();

            DataGridViewTextBoxColumn column;

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "Username";
            column.HeaderText = "Username";
            column.Width = 50;
            this.dgName.Columns.Add(column);

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "Name";
            column.HeaderText = "Name";
            column.Width = 100;
            this.dgName.Columns.Add(column);

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "Email";
            column.HeaderText = "Email";
            column.Width = 150;
            this.dgName.Columns.Add(column);

            dt = null;
        }

        private void btn_add_Click(object sender, EventArgs e)
        {
            
        }

        private void btn_edit_Click(object sender, EventArgs e)
        {

        }

        private void btn_del_Click(object sender, EventArgs e)
        {

        }

        private void btn_exit_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Are you sure to exit program?", "Confirm.", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
            {
                Application.Exit();
            }
        }

        private void btn_check_Click(object sender, EventArgs e)
        {
            try
            {
                string myConnection = "datasource=localhost;port=3306;username=root;password=1234;database=aprdb;";
                MySqlConnection myConn = new MySqlConnection(myConnection);
                MySqlDataAdapter myDataAdapter = new MySqlDataAdapter();
                myDataAdapter.SelectCommand = new MySqlCommand("select * from table;",myConn);
                MySqlCommandBuilder cb = new MySqlCommandBuilder(myDataAdapter);
                myConn.Open();
                DataSet ds = new DataSet();
                MessageBox.Show("Connected");
                myConn.Close();

            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}