private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.ReadOnly = true;
            textBox2.ReadOnly = true;
            textBox3.ReadOnly = true;
            LoadDatatoGridview();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
        private void LoadDatatoGridview()
        {
            string strconnect = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\\CodeTraining\\DataBase\\QuanLyBanHang.accdb";
            OleDbConnection connect = new OleDbConnection(strconnect);
            try
            {
                connect.Open();
                OleDbDataAdapter da = new OleDbDataAdapter("select * from sanpham", strconnect);
                DataTable dt = new DataTable();
                da.Fill(dt);
                dataGridView1.DataSource = dt;
                textBox1.DataBindings.Clear();
                textBox2.DataBindings.Clear();
                textBox3.DataBindings.Clear();
                textBox1.DataBindings.Add("text", dataGridView1.DataSource, "Masp");
                textBox2.DataBindings.Add("text", dataGridView1.DataSource, "Tensp");
                textBox3.DataBindings.Add("text", dataGridView1.DataSource, "DonViTinh");
            }
            catch(OleDbException ex)
            {
                MessageBox.Show("khong the ket noi voi sql server" + ex.Message, "thong bao", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            finally
            {
                connect.Close();
            }