11-16查询Student中的所有学生记录，并在table中显示。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;

namespace Demo3
{
    public partial class 查询 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string constr = "Data Source=.;Initial Catalog=Schools;Persist Security Info=True;User ID=sa;Password=910809";
            using (SqlConnection con = new SqlConnection(constr))
            {
                con.Open();
                using (SqlCommand cmd = con.CreateCommand ())
                { 
                    string sql = "select * from Student";
                    cmd.CommandText = sql;
                   
                    using (SqlDataReader reader=cmd.ExecuteReader ())
                    {
                      if(reader .HasRows)
                      {
                          while (reader .Read ())
                          {
                              TableRow trRow = new TableRow();//-------读取的是行
                             
                              //获取第一条记录的第一列中的值
                              TableCell trCell = new TableCell();//-----读取的是列
                              trCell.BorderStyle = BorderStyle.Solid;
                              trCell.BorderWidth = 1;
                              trCell.Text = reader.GetValue(0).ToString();
                              trRow.Cells.Add(trCell );//_------把列添加到行中
                              //获取第一条记录的第二列中的值
                              trCell = new TableCell();
                               trCell.BorderStyle = BorderStyle.Solid;
                               trCell.BorderWidth = 1;
                              trCell.Text =reader.GetValue(1).ToString();
                              trRow.Cells.Add(trCell);
                              //获取第一条记录的第三列中的值
                              trCell = new TableCell();
                              trCell.BorderStyle = BorderStyle.Solid;
                              trCell.BorderWidth = 1;
                              trCell.Text = reader.GetValue(2).ToString();
                              trRow.Cells.Add(trCell);
                              //获取第一条记录的第四列中的值
                              trCell = new TableCell();
                              trCell.BorderStyle = BorderStyle.Solid;
                              trCell.BorderWidth = 1;
                              trCell.Text = reader.GetValue(3).ToString();
                              trRow.Cells.Add(trCell);
                              //获取第一条记录的第五列中的值
                              trCell = new TableCell();
                                  trCell.BorderStyle = BorderStyle.Solid;
                               trCell.BorderWidth = 1;
                              trCell.Text = reader.GetValue(4).ToString();
                              trRow.Cells.Add(trCell);
                             
                              Table1.Rows.Add(trRow );//----------把行添加到table中去
                          }
                     
                      }
                    }

                }
            }

        }
    }
}