书本上抄的一模一样的程序为什么不显示数据啊？！！数据库都没有问题啊，到底是什么问题呢？
using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("server=PC2011040409KWA;database=图书订购系统;uid=sa;pwd=msm001018");
            SqlDataAdapter sda = new SqlDataAdapter("select * from 出版社信息", conn);
            DataSet ds = new DataSet();
            sda.Fill(ds, "出版社信息");
            dataGridView1.DataSource = ds.Tables["出版社信息"];            
        }
    }
}