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"];            
        }
    }
}

一种可能你的书上程序的数据库在你的电脑上不存在；
第二是:

sda.Fill(ds);
dataGridView1.DataSource = ds.Tables[0].DefaultView;

[ 本帖最后由 qq1023569223 于 2011-5-24 22:02 编辑 ]

sda.Fill(ds);
dataGridView1.DataSource = ds.Tables[0].DefaultView;

确定你的数据连接,是你自己的库...
代码没什么问题 !

  还可以起中文数据库名啊！                  我      表名也是中文的啊，
----------------------------------------------连接数据库类----------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;

namespace WindowsFormsApplication5
{
    class DBHelper
    {
        const string CONNECTIONSTRING = "Data Source=.\\sql2008;Initial Catalog= MyQQ;Integrated Security=True";
        public static SqlConnection GetCon()
        {
            return new SqlConnection(CONNECTIONSTRING);
        }
    }
}
--------------------------------------------------------使用方法----------------------------------------------------------------
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 WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

  

        private void Form1_Load(object sender, EventArgs e)
        {
            LoadMima();
            NewMethod();
            SqlConnection conn = DBHelper.GetCon();
            string sql = "select bloodtype from bloodtype";
            SqlCommand command = new SqlCommand(sql,conn);
            conn.Open();
            SqlDataReader reader = command.ExecuteReader();
            while (reader.Read())
            {
                cboBloodType.Items.Add(reader["bloodtype"].ToString());
            }
            reader.Close();
            conn.Close();
        }

我菜鸟不好意思   大家！我错了

确定你的数据链接和你的表名！