VS2015下简单使用EF框架的方法

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);    }   }    }    }}