DataReader应用小示例（数据库访问操作的基本过程2.0通过）

照书上改了一下，一个简单的查询结果，用到了
Sqlconnection
Sqlcommand
SqlDataReader
表：Sell
存储过程：GetProduct
========================================
CREATE PROCEDURE  GetProduct
 (
 @strName varchar(50)
 )
AS
 Select @strName=RTRIM(@strName) + '%'
 
SELECT SellID ,ProductName, UnitCost, Number
FROM Sell
WHERE (ProductName like  @strName)

RETURN

GO
=========================================
使用DataReader处理数据库时的流程图
1)使用SqlCommand对象执行sql语句
2)将SqlCommand读取的数据放在DataReader中
3)对DataReader数据进行处理显示

代码：

<% @ Page Language = " C# "  AutoEventWireup = " true "  CodeFile = " conn1.aspx.cs "  Inherits = " conn1 "   %>

<! DOCTYPE html PUBLIC  " -//W3C//DTD XHTML 1.0 Transitional//EN "   " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >

< html xmlns = " http://www.w3.org/1999/xhtml "   >
< head runat = " server " >
     < title > 无标题页 </ title >
</ head >
< body >
     < form id = " form1 "  runat = " server " >
     < div >
         & nbsp; < asp:TextBox ID = " TextBox1 "  runat = " server " ></ asp:TextBox >
         < asp:Button ID = " Button1 "  runat = " server "  OnClick = " Button1_Click "  Text = " Search "   />
         < br  />
         < br  />
         < asp:Label ID = " Label1 "  runat = " server " ></ asp:Label ></ div >
     </ form >
</ body >
</ html >

CS代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class conn1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = "";//清空结果
        SqlConnection myconn = new SqlConnection("server=localhost;database=OnNetBookSell;uid=sa;pwd=123");
        //定义command
        SqlCommand mycmd = new SqlCommand();
        mycmd.Connection = myconn;
        mycmd.CommandType  = CommandType.StoredProcedure;
        mycmd.CommandText  = "GetProduct";
        //增加一个参数
        SqlParameter sqlparam = new SqlParameter("@strName", SqlDbType.NVarChar, 50);
        sqlparam.Value = TextBox1.Text;
        mycmd.Parameters.Add(sqlparam);
        myconn.Open();

        //执行并显示
        SqlDataReader myreader = mycmd.ExecuteReader();
        while (myreader.Read())
        {
            Label1.Text += myreader["ProductName"];
            Label1.Text += "<br>";

        }
        myconn.Close();
        myreader.Close();

    }
}