Как обновить dataGridView не закрывая форму?

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;
using System.IO;
 
namespace mysql {
 public partial class Form1 : Form {
  string pathImageBrand = string.Empty;
  public Form1() {
   InitializeComponent();
  }
  //кнопка Browse
  private void button1_Click(object sender, EventArgs e) {
   openFileDialog1.Filter = "Images (*.jpg; *.jpeg; *.gif; *.bmp; *.ico; *.png) | *.jpg; *.jpeg; *.gif; *.bmp; *.ico; *.png";
   if(openFileDialog1.ShowDialog() == DialogResult.OK) {
    pathImageBrand = openFileDialog1.FileName.ToString();
   }
  }
  //кнопка Add
  private void button2_Click(object sender, EventArgs e) {
   string stringConnect = @"server=localhost;user id=root;password=12345;database=abc";
   string sql = "INSERT INTO avto VALUES('"+textBox1.Text+"', @imgBrands)";
 
   byte[] imgBrands = null;
   FileStream fsBrand = new FileStream(pathImageBrand, FileMode.Open, FileAccess.Read);
   BinaryReader brBrand = new BinaryReader(fsBrand);
   imgBrands = brBrand.ReadBytes((int)fsBrand.Length);
 
   using(MySqlConnection connect = new MySqlConnection(stringConnect)) {
    connect.Open();
    MySqlCommand command = new MySqlCommand(sql, connect);
    command.Parameters.Add(new MySqlParameter("@imgBrands", imgBrands));
    int x = command.ExecuteNonQuery();
    MessageBox.Show(x.ToString() + "record(s) saved");
   }
   textBox1.Clear();
  }
  //кнопка Refresh
  private void button3_Click(object sender, EventArgs e) {
   //обновить таблицу не закрывая, а затем открывая форму
   //dataGridView1.Update();
   dataGridView1.Refresh();
  }
  private void Form1_Load(object sender, EventArgs e) {
   // TODO: This line of code loads data into the 'abcDataSet.avto' table. You can move, or remove it, as needed.
   this.avtoTableAdapter.Fill(this.abcDataSet.avto);
  }
 }
}

  //кнопка Refresh
  private void button3_Click(object sender, EventArgs e) {
   //обновить таблицу не закрывая, а затем открывая форму
   this.avtoTableAdapter.Fill(this.abcDataSet.avto);
  }