This is the user controller

using ClassicCarAuction;
using ClassicCarAuction.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Security;

namespace ClassicCarAuction.Controllers
{
    public class UserController : Controller
    {
       // Return Home page.
        public ActionResult Index()
        {
            return View();
        }

        //Return Register view
        public ActionResult Register()
        {
            return View();
        }

        //The form's data in Register view is posted to this method.
        //We have binded the Register View with Register ViewModel, so we can accept object of Register class as parameter.
        //This object contains all the values entered in the form by the user.
        [HttpPost]
        public ActionResult SaveRegisterDetails(User registerDetails)
        {
            //We check if the model state is valid or not. We have used DataAnnotation attributes.
            //If any form value fails the DataAnnotation validation the model state becomes invalid.
            if (ModelState.IsValid)
            {
                try
                {
                    //create database context using Entity framework
                    using (var databaseContext = new ClassicCarAuctionContext())
                    {
                        //If the model state is valid i.e. the form values passed the validation then we are storing the User's details in DB.
                        User reglog = new User();

                        //Save all details in RegitserUser object

                        reglog.FirstName = registerDetails.FirstName;
                        reglog.LastName = registerDetails.LastName;
                        reglog.Password = registerDetails.Password;

                        var isValidEmail = IsValidEmail(registerDetails);
                        if (isValidEmail != null)
                        {
                            ModelState.AddModelError("Failure", "This Email address has already been used !");

                            return View("Register");
                        }
                        else
                        {
                            reglog.Email = registerDetails.Email;

                        }

                        //Calling the SaveDetails method which saves the details.
                        databaseContext.Users.Add(reglog);
                        databaseContext.SaveChanges();
                    }

                    return View("ThankYou");
                }

                catch
                {
                    //If the validation fails, we are returning the model object with errors to the view, which will display the error messages.
                    ModelState.AddModelError("Failure", "All the information is required !");
                    return View("Register");
                }

            }
            return View("Register");
        }


        public ActionResult Login()
        {
            return View();
        }

        //The login form is posted to this method.
        [HttpPost]
        public ActionResult Login(User model)
        {
            //Checking the state of model passed as parameter.
            if (ModelState.IsValid)
            {

                //Validating the user, whether the user is valid or not.
                var isValidUser = IsValidUser(model);

                //If user is valid & present in database, we are redirecting it to Welcome page.
                if (isValidUser != null)
                {
                    FormsAuthentication.SetAuthCookie(model.Email, false);
                    return RedirectToAction("Index");
                }
                else
                {
                    //If the username and password combination is not present in DB then error message is shown.
                    ModelState.AddModelError("Failure", "Wrong Username and password combination !");
                    return View();
                }
            }
            else
            {
                //If model state is not valid, the model with error message is returned to the View.
                return View(model);
            }
        }

        //function to check if User is valid or not
        public User IsValidUser(User model)
        {
            using (var dataContext = new ClassicCarAuctionContext())
            {
                //Retrieving the user details from DB based on email and password enetered by user.
                User user = dataContext.Users.Where(query => query.Email.Equals(model.Email) && query.Password.Equals(model.Password)).SingleOrDefault();
                //If user is not present false is returned.
                if (user == null)
                    return null;
                //If user is present, then true is returned.
                else
                {
                    return user;
                }
            }
        }


        public User IsValidEmail(User model)
        {
            using (var dataContext = new ClassicCarAuctionContext())
            {

                //Retrieving the user details from DB based on Email entered by user.
                User user = dataContext.Users.Where(query => query.Email.Equals(model.Email)).SingleOrDefault();
                //If user is present, then true is returned.
                if (user == null)
                    return null;
                //If user is not present false is returned.
                else
                    return user;
            }
        }

        public ActionResult Logout()
        {
            FormsAuthentication.SignOut();
            Session.Abandon(); // it will clear the session at the end of request
            return RedirectToAction("../Home/Index");
        }
    }
}

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using ClassicCarAuction;
using ClassicCarAuction.Models;
using ClassicCarAuction.Controllers;

namespace ClassicCarAuction.Controllers
{
    public class CarAuctionController : Controller
    {
        // GET: CarAuction
        ClassicCarAuctionContext db = new ClassicCarAuctionContext();
        public ActionResult Index()
        {
            foreach (var item in db.CarLists)
            {
                DateTime ReturnDate = System.DateTime.Now;
            if (ReturnDate < item.AuctionEndDate)
            {
                if (item.HighestBid < item.ReserveBid)
                    item.Status = "Reserve has not been met";
                else item.Status = "Reserve has been met";

            }
            else
            {
                if (item.HighestBid < item.ReserveBid)
                    item.Status = "Auction has ended. Reserve has not been met";
                else item.Status = "Auction has ended. Reserve has been met";

            }

            }
            db.SaveChanges();
            return View(db.CarLists.ToList());

        }

        // GET: CarAuction/Details/5
        public ActionResult Details(int id)
        {
            return View();
        }

        // GET: CarAuction/Create
        [HttpGet]
        public ActionResult Create()
        {
            return View();
        }
        // POST: CarAuction/Create
        [HttpPost]
        public ActionResult Create(CarList carlist)
        {
            try
            {
                // TODO: Add insert logic here
                if (ModelState.IsValid)
                {
                    db.CarLists.Add(carlist);

                    if (carlist.HighestBid < carlist.ReserveBid)
                        carlist.Status = "Reserve has not been met";
                    else carlist.Status = "Reserve has been met";
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }
                return View();
            }
            catch
            {
                return View();
            }
        }

        // GET: CarAuction/Edit/5
        public ActionResult Edit(int id)
        {
               CarList carList = db.CarLists.Find(id);
                carList.CheckifMore = carList.HighestBid;
                db.SaveChanges();
                return View(carList);
        }

        // POST: CarAuction/Edit/5
        [HttpPost]
        public ActionResult Edit(CarList carlist)
        {

            try
            {
                // TODO: Add update logic here

              if ((carlist.Status == "Reserve has not been met") || (carlist.Status == "Reserve has been met"))
                {
                    if (carlist.HighestBid > carlist.CheckifMore)
                    {
                        if (ModelState.IsValid)
                        {
                            db.Entry(carlist).State = EntityState.Modified;
                            if (carlist.HighestBid >= carlist.ReserveBid)
                            {
                                carlist.Status = "Reserve has been met";
                            }
                            db.SaveChanges();
                            return RedirectToAction("Index");
                        }
                    }
                    else
                    {
                        carlist.HighestBid = carlist.CheckifMore;
                        db.SaveChanges();
                        return RedirectToAction("Index");
                    }
                    return View("Index");
                }
                return RedirectToAction("Index");
            }
            catch
            {
                return View("Index");
            }
        }

        // GET: CarAuction/Delete/5
        public ActionResult Delete(int id)
        {
            return View();
        }

        // POST: CarAuction/Delete/5
        [HttpPost]
        public ActionResult Delete(int id, FormCollection collection)
        {
            try
            {
                // TODO: Add delete logic here

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
    }
}

@model ClassicCarAuction.Models.User
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

@if (Request.IsAuthenticated)
{
    <h2>
        <p>Thank you for logging in @Html.Encode(User.Identity.Name). Now you can create and bid on listings.</p>


        @Html.ActionLink("Listings", "Index", "CarAuction")<br />
    </h2>
}
else
{
    <h2>
        <p>
            If you have already registered, Please login to create or bid on listings.<br />
            @Html.ActionLink("Login", "Login", "User")<br />
        </p>
        <p>
            If you have not registered yet, you will need to do so before you can log in.<br />
            @Html.ActionLink("Register", "Register", "User")
        </p>

    </h2>
}

@model ClassicCarAuction.Models.User

 @{

    ViewBag.Title = "Login";

}

<h2>Login</h2>

<div>
    @using (Html.BeginForm("Login", "User"))
    {
        <div style="color:red;">@Html.ValidationSummary()</div>
        <div class="row">
            <!--Show details are saved successfully message-->
            <div class="col-lg-12">@ViewBag.Message</div>
        </div><br />

        <div class="row">
            <div class="col-lg-2">@Html.LabelFor(a => a.Email)</div>
            <div class="col-lg-10">@Html.TextBoxFor(a => a.Email, new { @class = "form-control" })</div>
        </div><br />
        <div class="row">
            <div class="col-lg-2">@Html.LabelFor(a => a.Password)</div>
            <div class="col-lg-10">@Html.TextBoxFor(a => a.Password, new { @class = "form-control", type = "Password" })</div>
        </div><br />
        <input type="submit" value="Login" class="btn btn-primary" />
    }

</div>