学步园

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

namespace DataSet2
{
    public partial class DataSet1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //1.创建一个临时数据库
            DataSet ds = new DataSet("School");

            //2.创建一个临时数据表
            DataTable dt = new DataTable("Student");
             
            //2.1为dt增加列
            DataColumn dcAutoId = new DataColumn("FId");
            dcAutoId.AutoIncrement = true;
            dcAutoId.AutoIncrementSeed = 1;
            dcAutoId.AutoIncrementStep = 1;
            dt.Columns.Add(dcAutoId);//把这个列加到dt这个表中。

            //2.2再来增加2列

            //DataColumn dcName = new DataColumn("studentName", typeof(string));
            //dt.Columns.Add(dcName);

            dt.Columns.Add("studentName", typeof(string));
            dt.Columns.Add("studentPwd", typeof(string));
           
            dt.Columns[0].Unique = true;

            //2.3为表dt增加行
            for (int i = 0; i < 10; i++)
            {
               DataRow dr = dt.NewRow();
            dr[1] = "YQQ"+i.ToString();
            dr[2] = "555";

            dt.Rows.Add(dr);//把行添加到表中
            }
    
            //3.把数据表dt放到ds数据库中
            ds.Tables.Add(dt);

            #region 循环输出dataset中的表及内容
            foreach (DataTable dtItem in ds.Tables)//从临时数据库中遍历其中的每一个表
            {
                Response.Write("====" + dtItem.TableName + "====");//输出表名
                Response.Write("<p>");

                //之后还要输出表中的每一行。
                foreach (DataRow drItem in dtItem.Rows)
                {
                    //循环取出每行中的每个列
                    for (int i = 0; i < dtItem.Columns.Count; i++)
                    {
                        Response.Write(drItem[i].ToString() + "&nbsp&nbsp&nbsp");
                    }
                    Response.Write("<br>");
                }

            }
            #endregion

            GridView1.DataSource=ds.Tables[0];
            GridView1.DataBind();

        }
    }
}