.net Access 新增记录后获取自动编号的值

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;

namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
        OleDbConnection myConnection;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
          myConnection = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Logs.mdb;Persist Security Info=False");
          string cmdText="insert   into   LogInfo   (LeiBie)   values('bbb')";

          int sss=returnID(cmdText);
     
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public  int returnID(string sql)
        {
            int nID = 0;
            try
            {
                myConnection.Open();
                OleDbTransaction myTransaction = myConnection.BeginTransaction(IsolationLevel.ReadCommitted);
                OleDbCommand myCommand = new OleDbCommand(sql, myConnection);
                myTransaction.Commit();
                myCommand.ExecuteNonQuery();
                myCommand.CommandText = "select @@identity as id";
                nID = Convert.ToInt32(myCommand.ExecuteScalar());
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                myConnection.Close();
            }
            return nID;
        }

    }
}