reading csv file to update acess mdb

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;
//-------------------------
using System.Data.OleDb;
using System.IO;
using System.Globalization;
using System.Data.SqlClient;



namespace testupdate
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string strCvsFileName = "09760005.csv";
            string pathOnly = Directory.GetCurrentDirectory();
            string sql = @"SELECT * FROM [" + strCvsFileName + "]";

            using (OleDbConnection connection = new OleDbConnection(
                      @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathOnly + ";Extended Properties=\"Text;HDR=YES\""))
            using (OleDbCommand command = new OleDbCommand(sql, connection))
            using (OleDbDataAdapter adapter = new OleDbDataAdapter(command))
            {
                DataTable dataTable = new DataTable();
                dataTable.Locale = CultureInfo.CurrentCulture;
                adapter.Fill(dataTable);
                dataGridView1.DataSource = dataTable;

                OleDbConnection DBconn = new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0;Data Source=DATAGRP.MDB;");
                DBconn.Open();

                for (int i = 0; i < dataTable.Rows.Count; i++)
                {
                    OleDbCommand cmd = new OleDbCommand();
                    cmd.Connection = DBconn;
                    cmd.CommandText = "UPDATE INDEXDB1 SET IFIELD1= @IFIELD1, IFIELD2 = @IFIELD2, IFIELD3 = @IFIELD3, IFIELD4= @IFIELD4, IFIELD5 = @IFIELD5, IFIELD6 = @IFIELD6, IFIELD7 = @IFIELD7 WHERE IDNUM= @IDNUM";

                    cmd.Parameters.AddWithValue("@IFIELD1", dataTable.Rows[i].ItemArray.GetValue(1).ToString());
                    cmd.Parameters.AddWithValue("@IFIELD2", dataTable.Rows[i].ItemArray.GetValue(2).ToString());
                    cmd.Parameters.AddWithValue("@IFIELD3", dataTable.Rows[i].ItemArray.GetValue(3).ToString());
                    cmd.Parameters.AddWithValue("@IFIELD4", String.Format("{0:MM/dd/yyyy}", dataTable.Rows[i][4]));
                    cmd.Parameters.AddWithValue("@IFIELD5", String.Format("{0:MM/dd/yyyy}", dataTable.Rows[i][5]));
                    cmd.Parameters.AddWithValue("@IFIELD6", String.Format("{0:MM/dd/yyyy}", dataTable.Rows[i][6]));
                    cmd.Parameters.AddWithValue("@IFIELD7", dataTable.Rows[i].ItemArray.GetValue(7).ToString());
                    cmd.Parameters.AddWithValue("@IDNUM", dataTable.Rows[i].ItemArray.GetValue(0).ToString());
                  
                    cmd.ExecuteNonQuery();
                }
                DBconn.Close(); 
            }
        }
    }
}