asp.net 4.5 exercise~test13-2 linq

webform1.aspx

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

namespace test13_2
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            List<News> dataM = new List<News>
            {
                new News { title="冬奥会开幕了！",id=4888,categories="国际新闻"},
                new News { title="中国第一艘航母下水！",id=4580,categories="中国新闻"},
                new News { title="IPHONE 5S上市了！",id=4688,categories="国际新闻"},
                new News { title="发行新股将实行注册制度！",id=3888,categories="中国新闻"},
                new News { title="美国政府暂时停止工作！",id=2888,categories="国际新闻"},
                new News { title="新兴市场股票大涨！",id=4568,categories="国际新闻"}
            };

            var query1 = from str in dataM
                         where str.categories == "国际新闻"
                         orderby str.id descending
                         select str.title;  // select str;

            Response.Write("<strong>热点新闻包括：</strong><br>");
            foreach (var news in query1)
            {
                Response.Write(news + "<br>");
                //Response.Write(news.title + "<br>");
            }
        }
    }
}

news.cs class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace test13_2
{
    class News
    {
        public int id { get; set; }
        public string title { get; set; }
        public string categories { get; set; }
    }
}