Discuss how to use the EF framework under VS2015

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);
    }
   }
 
 
  }
 
  
 }
}