The type of namespace name '_comicBookRepository' could not be found

using DemoProject.Data;
using DemoProject.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace DemoProject.Controllers
{
    public class ComicBooksController : Controller
    {
        private ComicBookRepository _comicBookRepository = null;

        public ComicBooksController()
        {
            _comicBookRepository = new ComicBookRepository();
        }

        public ActionResult Detail(int? id)
        {
            if (id == null)
            {
                return HttpNotFound();
            }

            var comicBook = new _comicBookRepository.GetComicBook(id.Value);

            return View(comicBook);
        }
    }
}

using DemoProject.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace DemoProject.Data
{
    public class ComicBookRepository
    {
        private static ComicBook[] _comicBooks = new ComicBook[]
        {          
           new ComicBook()
            {
                SeriesTitle = "The Amazing Spider-Man",
                IssueNumber = 700,
                DescriptionHtml = "<p>Final issue! Witness the final hours of Doctor Octopus' life and his one, last, great act of revenge! Even if Spider-Man survives...<strong>will Peter Parker?</strong></p>",
                Artists = new Artist[]
                {
                    new Artist() { Name = "Dan Slott", Role = "Script" },
                    new Artist() { Name = "Humberto Ramos", Role = "Pencils" },
                    new Artist() { Name = "Victor Olazaba", Role = "Inks" },
                    new Artist() { Name = "Edgar Delgado", Role = "Colors" },
                    new Artist() { Name = "Chris Eliopoulos", Role = "Letters" },
                },
                Favorite = false
            },
            new ComicBook()
            {
                SeriesTitle = "The Amazing Spider-Man",
                IssueNumber = 657,
                DescriptionHtml = "<p><strong>FF: THREE TIE-IN.</strong> Spider-Man visits the FF for a very private wake--just for family.</p>",
                Artists = new Artist[]
                {
                    new Artist() { Name = "Dan Slott", Role = "Script" },
                    new Artist() { Name = "Marcos Martin", Role = "Pencils" },
                    new Artist() { Name = "Marcos Martin", Role = "Inks" },
                    new Artist() { Name = "Muntsa Vicente", Role = "Colors" },
                    new Artist() { Name = "Joe Caramagna", Role = "Letters" }
                },
                Favorite = false
            },
            new ComicBook()
            {
                SeriesTitle = "Bone",
                IssueNumber = 50,
                DescriptionHtml = "<p><strong>The Dungeon & The Parapet, Part 1.</strong> Thorn is discovered by Lord Tarsil and the corrupted Stickeaters and thrown into a dungeon with Fone Bone. As she sleeps, a message comes to her about the mysterious \"Crown of Horns\".</p>",
                Artists = new Artist[]
                {
                    new Artist() { Name = "Jeff Smith", Role = "Script" },
                    new Artist() { Name = "Jeff Smith", Role = "Pencils" },
                    new Artist() { Name = "Jeff Smith", Role = "Inks" },
                    new Artist() { Name = "Jeff Smith", Role = "Letters" }
                },
                Favorite = false
            }
        };

        public ComicBook GetComicBook(int id)
        {
            ComicBook comicBookToReturn = null;

            foreach (var comicBook in _comicBooks)
            {
                if (comicBook.Id == id)
                {
                    comicBookToReturn = comicBook;

                    break;
                }
            }
            return comicBookToReturn;
        }
    }
}