public class UserLogin
{
    public static string userName
    {
       get { return Convert.ToString(HttpContext.Current.Session["LoggedUser"]); }
       set { HttpContext.Current.Session["LoggedUser"] = value; }
    }

    public static string userPass
    {
        get { return Convert.ToString(HttpContext.Current.Session["LoggedPass"]); }
        set { HttpContext.Current.Session["LoggedPass"] = value; }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using LoginFormMVC.Models;

namespace LoginFormMVC.Controllers
{
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult About()
    {
        ViewBag.Message = "Your application description page.";

        return View();
    }

    public ActionResult Contact()
    {
        ViewBag.Message = "Your contact page.";

        return View();
    }


    public ActionResult LogIn()
    {
        return View("About");
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult LogIn(UserLogin u)
    {

        using (OTR2WCF.OTR2ServiceClient service = new OTR2WCF.OTR2ServiceClient())
        {

            var strResult = service.LoginUserJSON(LoginFormMVC.Models.UserLogin.userName, LoginFormMVC.Models.UserLogin.userName);

            u = null;

            if ((strResult != "[]") && (strResult.StartsWith("Error: ") == false))
            {
                UserLogin.userName = LoginFormMVC.Models.UserLogin.userName;
                UserLogin.userPass = LoginFormMVC.Models.UserLogin.userName;
                ModelState.AddModelError("", "Correct username and password");

            }

            else
            {
                ModelState.AddModelError("", "Wrong username or password");
            }



        }
        return View();
    }
}
}

@model LoginFormMVC.Models.UserLogin

 @{
  ViewBag.Title = "LogIn";
 }

  <h2>LogIn</h2>


    @using (Html.BeginForm("LogIn", "Home", FormMethod.Post))
      {
     @Html.AntiForgeryToken()

     <div class="form-horizontal">
    <h4>UserLogin</h4>
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(model => LoginFormMVC.Models.UserLogin.userName, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => LoginFormMVC.Models.UserLogin.userName, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => LoginFormMVC.Models.UserLogin.userName, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => LoginFormMVC.Models.UserLogin.userPass, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => LoginFormMVC.Models.UserLogin.userPass, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => LoginFormMVC.Models.UserLogin.userPass, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <button type="submit">New Request</button>
        </div>
    </div>
</div>
}

<div>
@Html.ActionLink("Back to List", "Index")
</div>

 @section Scripts {
  @Scripts.Render("~/bundles/jqueryval")
 }