VS2015下简单使用EF框架

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

namespace WebApplication4
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected readonly tb_FaceGroup _context;

        private readonly ADEntities datesql = new ADEntities();
        protected void Page_Load(object sender, EventArgs e)
        {
            ADEntities db = new ADEntities();//所需要实例化的类

            //添加动作
            //tb_user dd = new tb_user();
            //dd.ID = "ddsds";
            //dd.Wid = "dsdssd";
            //db.tb_user.Add(dd);
            //db.SaveChanges();--把以上代码变更到数据库



            //查询
            //  List<tb_user> lstOrder = new List<tb_user>();

            tb_user lstOrder = new tb_user();
           //  lstOrder = datesql.tb_user.GroupBy(r => r.ID == "ddsds");

            var info = datesql.tb_user.OrderByDescending(r => r.ID == "ddsds");//    .FirstOrDefault(r => r.ID == "ddsds");


            //打印查询结果  
            if (info.Any())
            {
                foreach (var userEntity in info)
                {
                    Console.WriteLine(userEntity.ID + "----" + userEntity.Wid);
                }
            }


        }

      
    }
}