数据交换学习二：asp.net C# 对 sqlserver表的操作

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;
 
//显示数据示例 
public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //创建表及插入数据
        //use jwcrm
        //create table userinfo(username char(10),userpwd char(10))
        //insert into userInfo values('潘万飞','123456')
        //insert into userInfo values('李世明','678910')
        //select * from userinfo
       
        //连接SQL
        SqlConnection thisConnection = new SqlConnection("Server=127.0.0.1;uid=sa;pwd=123;database=jwcrm");
 
        //创建数据库适配器
        SqlDataAdapter thisAdapter = new SqlDataAdapter("select * from userinfo", thisConnection);
        SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);
        DataSet thisDataSet = new DataSet();
        thisAdapter.Fill(thisDataSet, "userinfo");
        int i = 0;
        foreach(DataRow rowData in thisDataSet.Tables[0].Rows)
        {
            i++;
      &n