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我是个新手，在用。NET做一个简单的网页，连接了一下数据库，在C#里以前一直只是把数据库拉到页面就能连接了，但是这次就不行了，出现登陆失败的错误！
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace WebApplication3
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
  protected System.Data.SqlClient.SqlCommand sqlSelectCommand1;
  protected System.Data.SqlClient.SqlCommand sqlInsertCommand1;
  protected System.Data.SqlClient.SqlConnection sqlConnection1;
  protected System.Data.SqlClient.SqlDataAdapter sqlDataAdapter1;

  private void Page_Load(object sender, System.EventArgs e)
  {
  string sql = "SELECT * FROM user_info";
  string aaa ;
  sqlConnection1.Open();
  sqlSelectCommand1 = new SqlCommand(sql,sqlConnection1);
  SqlDataReader dr = sqlSelectCommand1.ExecuteReader();
  if(dr.Read())
    aaa = "ok";
  else
    aaa = "no";
  string html = "<table><tr><td>"+aaa+"</td></tr></table>";
  Response.Write(html);
 
  // 在此处放置用户代码以初始化页面
  }
  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
  //
  // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
  //
  InitializeComponent();
  base.OnInit(e);
  }
 
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {   
  this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();
  this.sqlInsertCommand1 = new System.Data.SqlClient.SqlCommand();
  this.sqlConnection1 = new System.Data.SqlClient.SqlConnection();
  this.sqlDataAdapter1 = new System.Data.SqlClient.SqlDataAdapter();
  //
  // sqlSelectCommand1
  //
  this.sqlSelectCommand1.CommandText = "SELECT telephone, input_time, bill_time, quit_time FROM user_info";
  this.sqlSelectCommand1.Connection = this.sqlConnection1;
  //
  // sqlInsertCommand1
  //
  this.sqlInsertCommand1.CommandText = "INSERT INTO user_info(telephone, input_time, bill_time, quit_time) VALUES (@telep" +
    "hone, @input_time, @bill_time, @quit_time); SELECT telephone, input_time, bill_t" +
    "ime, quit_time FROM user_info";
  this.sqlInsertCommand1.Connection = this.sqlConnection1;
  this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@telephone", System.Data.SqlDbType.VarChar, 12, "telephone"));
  this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@input_time", System.Data.SqlDbType.VarChar, 50, "input_time"));
  this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@bill_time", System.Data.SqlDbType.VarChar, 50, "bill_time"));
  this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@quit_time", System.Data.SqlDbType.VarChar, 50, "quit_time"));
  //
  // sqlConnection1
  //
  this.sqlConnection1.C +
    "ource=zhu;persist security info=False;initial catalog=TEL_XYELY";
  //
  // sqlDataAdapter1
  //
  this.sqlDataAdapter1.InsertCommand = this.sqlInsertCommand1;
  this.sqlDataAdapter1.SelectCommand = this.sqlSelectCommand1;
  this.sqlDataAdapter1.TableMappings.AddRange(new System.Data.Common.DataTableMapping[] {
                          new System.Data.Common.DataTableMapping("Table", "user_info", new System.Data.Common.DataColumnMapping[] {
                                                      new System.Data.Common.DataColumnMapping("telephone", "telephone"),
                                                      new System.Data.Common.DataColumnMapping("input_time", "input_time"),
                                                      new System.Data.Common.DataColumnMapping("bill_time", "bill_time"),
                                                      new System.Data.Common.DataColumnMapping("quit_time", "quit_time")})});
  this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion
}
付上代码请高手指正！

尽量不要用.net自己的数据源
page_load的代码

SqlConnection conn = new SqlConnection( "你的数据库连接字符串" );//Password=sa;User ID=sa;Initial Catalog=dnt2;Data Source=.
conn.Open();
Command com = new Command( conn,"SELECT * FROM user_info" );
SqlDataReader sdr = com.ExecuteReader();
  if(dr.Read())
    aaa = "ok";
  else
    aaa = "no";
  string html = "<table><tr><td>"+aaa+"</td></tr></table>";
conn.Close()
  Response.Write(html);