EXCEL文件的SQL語句

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 操作Excel
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnQuery_Click(object sender, EventArgs e)
        {
            System.Data.OleDb.OleDbConnection Conn = new System.Data.OleDb.OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\a.xls;Extended PropertIEs=Excel 8.0;");
          DataSet   ds = new DataSet();
            OleDbDataAdapter da = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", Conn);//刪除語句沒搞定，有時間了繼續測試。。。
           
            try
            {
                da.Fill(ds);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);