CS0234: type or namespace name 'StudentViewModel.' does not exist in the namespace 'ContosoUniversity.ViewModels' - asp.net-mvc-4

Question

Error : CS0234: The type or namespace name 'StudentViewModel' does not exist in the namespace 'ContosoUniversity.ViewModels' (are you missing an assembly reference?)
https://www.dropbox.com/s/vqusln7le5fklxg/%D0%91%D0%B5%D0%B7%D1%8B%D0%BC%D1%8F%D0%BD%D0%BD%D1%8B%D0%B9.jpg?dl=0
public ActionResult Index(string sortOrder, string currentFilter, string searchString, int? page)
{
ViewBag.CurrentSort = sortOrder;
ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
if (searchString != null)
{
page = 1;
}
else
{
searchString = currentFilter;
}
ViewBag.CurrentFilter = searchString;
var students = from s in studentService.GetAll()
select s;
if (!String.IsNullOrEmpty(searchString))
{
students = students.Where(s => s.LastName.ToUpper().Contains(searchString.ToUpper())
|| s.FirstMidName.ToUpper().Contains(searchString.ToUpper()));
}
switch (sortOrder)
{
case "name_desc":
students = students.OrderByDescending(s => s.LastName);
break;
case "Date":
students = students.OrderBy(s => s.EnrollmentDate);
break;
case "date_desc":
students = students.OrderByDescending(s => s.EnrollmentDate);
break;
default:
students = students.OrderBy(s => s.LastName);
break;
}
int pageSize = 3;
int pageNumber = (page ?? 1);
return View(students.ToPagedList(pageNumber, pageSize));
}
My Class
using ContosoUniversity.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
namespace ContosoUniversity.ViewModels
{
public class StudentViewModel
{
public int ID { get; set; }
[Display(Name = "Last Name")]
public string LastName { get; set; }
[Display(Name = "First Name")]
public string FirstMidName { get; set; }
[Display(Name = "Enrollment Date")]
[DisplayFormat(DataFormatString = "{0:g}", ApplyFormatInEditMode = true)]
public DateTime EnrollmentDate { get; set; }
[Display(Name = "Date Of Birth")]
[DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
public DateTime DateOfBirth { get; set; }
public string FullName
{
get
{
return FirstMidName + LastName;
}
}
public virtual ICollection<Enrollment> Enrollments { get; set; }
public List<Comment> Comments { get; set; }
}
}
View:
#model PagedList.IPagedList<ContosoUniversity.ViewModels.StudentViewModel>
#using PagedList.Mvc;
<link href="~/Content/PagedList.css" rel="stylesheet" type="text/css" />
#{
ViewBag.Title = "Students";
}
<h2>Students</h2>
<p>
#Html.ActionLink("Create New", "Create")
</p>
#using (Html.BeginForm("Index", "Student", FormMethod.Get))
{
<p>
Find by name: #Html.TextBox("SearchString", ViewBag.CurrentFilter as string)
<input type="submit" value="Search" />
</p>
}
<table class="table">
<tr>
<th>
#Html.ActionLink("Last Name", "Index", new { sortOrder = ViewBag.NameSortParm })
</th>
<th>
First Name
</th>
<th>
#Html.ActionLink("Enrollment Date", "Index", new { sortOrder = ViewBag.DateSortParm })
</th>
<th>
Date Of Birth
</th>
<th>
Full Name
</th>
<th></th>
</tr>
#foreach (var item in Model) {
<tr>
<td>
#Html.DisplayFor(modelItem => item.LastName)
</td>
<td>
#Html.DisplayFor(modelItem => item.FirstMidName)
</td>
<td>
#Html.DisplayFor(modelItem => item.EnrollmentDate)
</td>
<td>
#Html.DisplayFor(modelItem => item.DateOfBirth)
</td>
<td>
#Html.DisplayFor(modelItem => item.FullName)
</td>
<td>
#Html.ActionLink("Edit", "Edit", new { id=item.ID }) |
#Html.ActionLink("Details", "Details", new { id=item.ID }) |
#Html.ActionLink("Delete", "Delete", new { id=item.ID })
</td>
</tr>
}
</table>
<br />
Page #(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of #Model.PageCount
#Html.PagedListPager(Model, page => Url.Action("Index",
new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))
I think something might be wrong with view model or automapper if need some more code please write to me!