public abstract class AbUserAll     {         public abstract IQueryable<User_ALL> FindUserAll();         public abstract User_ALL FindUserAllById(int userid);         public abstract void Add(User_ALL user);         public abstract void Update(User_ALL user);         public abstract void Delete(User_ALL user);         public abstract void Save();     }

using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace WF.Models.DAL {     public class UserDal:IDAL.AbUserAll     {         private PL_ModelDataContext db = new PL_ModelDataContext();         public override IQueryable<User_ALL> FindUserAll()         {             return db.User_ALL;         }         public override void Delete(User_ALL user)         {             db.User_ALL.DeleteOnSubmit(user);         }         public override void Save()         {             db.SubmitChanges();         }         public override User_ALL FindUserAllById(int userid)         {             return db.User_ALL.SingleOrDefault(o => o.INT == userid);         }         public override void Add(User_ALL user)         {             db.User_ALL.InsertOnSubmit(user);         }         public override void Update(User_ALL user)         {             var editStudent = db.User_ALL.SingleOrDefault<User_ALL>(s => s.INT == user.INT);             if (editStudent != null)             {                 editStudent.UserName = user.UserName;                 editStudent.Address = user.Address;             }             db.SubmitChanges();         }     } }

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; namespace WF.Controllers {     public class UserController : Controller     {         Models.DAL.UserDal dbuser = new Models.DAL.UserDal();         //         // GET: /User/         public ActionResult UserList()         {             return View(dbuser.FindUserAll());         }           //         // GET: /User/Create         public ActionResult Create()         {             return View();         }         //         // POST: /User/Create         [HttpPost]         public ActionResult Create(FormCollection collection,Models.User_ALL user)         {             try             {                 dbuser.Add(user);                 dbuser.Save();                 return RedirectToAction("UserList");             }             catch             {                 return View();             }         }         //         // GET: /User/Edit/5         public ActionResult UserEdit(int id)         {             return View(dbuser.FindUserAllById(id));         }         //         // POST: /User/Edit/5         [HttpPost]         public ActionResult UserEdit(Models.User_ALL user, FormCollection collection)         {             try             {                  dbuser.Update(user);                 dbuser.Save();                 return RedirectToAction("UserList");             }             catch             {                 return View();             }         }     } }