ข้างล่างคือ Code ข้างต้นที่ผมทำนะครับ  ตัวที่ comment ไว้คือถ้าปลด comment ออกระบบรันแล้ว error

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 System.Data;
using System.Data.OleDb;

namespace connect2tbl
{
    public partial class Form1 : Form
    {
        private OleDbConnection connection = new OleDbConnection();
        public Form1()
        {
            InitializeComponent();
            connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\SK\Documents\Database2.accdb;
Persist Security Info=False;";
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                connection.Open();
                OleDbCommand cmd = new OleDbCommand();
                cmd.Connection = connection;
                cmd.CommandText = "insert into Table1 (name) values ('"+ this.txtname.Text+"')";
                //cmd.CommandText = "insert into Table2 (no,book_no) values ('"+this.txtno.Text+ "','"+this.txtbook.Text+"')";
                //cmd.CommandText = "insert into Table3 (addname) values ('" + this.txtaddname.Text + "')";
                cmd.ExecuteNonQuery();
                MessageBox.Show("บันทึกเรียบร้อย");
                connection.Close();
                this.txtname.Text = "";
                this.txtno.Text = "";
                this.txtbook.Text = "";
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error" + ex);
            }
        }
    }
}