Download.cshtml

@model IEnumerable<MvcFileUploadToDB.Models.FileUploadDBModel>

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Upload New", "Index")
</p>

<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.FileName)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.File)
        </th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.FileName)
            </td>
            <td>
                @Html.ActionLink("Download", "Filedownload", new { id=item.Id})
            </td>
        </tr>
    }

</table>

FileUploadDBContext.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;

namespace MvcFileUploadToDB.Models
{
    public class FileUploadDBContext : DbContext
    {

        public FileUploadDBContext()
            : base("name=FileUploadDBContext")
        {
        }

        public System.Data.Entity.DbSet<MvcFileUploadToDB.Models.FileUploadDBModel> FileUploadDBModels { get; set; }
    
    }
}

HomeController.cs

using MvcFileUploadToDB.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;

namespace MvcFileUploadToDB.Controllers
{
    public class HomeController : Controller
    {
        private FileUploadDBContext db = new FileUploadDBContext();

        public ActionResult Index()
        {
            var model = new MyViewModel();
            return View(model);
        }

        [HttpPost]
        public ActionResult Index(MyViewModel model)
        {
            if (!ModelState.IsValid)
            {
                return View(model);
            }

            FileUploadDBModel fileUploadModel = new FileUploadDBModel();

            foreach (var item in model.File)  //3rd change
            {
                byte[] uploadFile = new byte[item.InputStream.Length];
                item.InputStream.Read(uploadFile, 0, uploadFile.Length);

                fileUploadModel.FileName = item.FileName;
                fileUploadModel.File = uploadFile;

                db.FileUploadDBModels.Add(fileUploadModel);
                db.SaveChanges();
            }

            return Content("File Uploaded.");
        }

        public ActionResult Download()
        {
            return View(db.FileUploadDBModels.ToList());
        }

        public FileContentResult FileDownload(int? id)
        {
            byte[] fileData;
            string fileName;

            FileUploadDBModel fileRecord = db.FileUploadDBModels.Find(id);

            fileData = (byte[])fileRecord.File.ToArray();
            fileName = fileRecord.FileName;

            return File(fileData, "text", fileName);
        }



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

            return View();
        }

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

            return View();
        }
    }
}

Index.cshtml

@model MvcFileUploadToDB.Models.MyViewModel

@{
    ViewBag.Title = "Home Page";
}

<div class="jumbotron">
    @using (Html.BeginForm(null, null, FormMethod.Post, new { enctype = "multipart/form-data" }))
    {
        <div>
            @Html.LabelFor(x => x.File)
            @Html.TextBoxFor(x => x.File, new { type = "file", multiple = "true" })  @*1st change*@
            @Html.ValidationMessageFor(x => x.File)
        </div>
        <button type="submit">Upload File</button>
    }
</div>

<p>
    @Html.ActionLink("Download File", "Download")
</p>

MyViewModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace MvcFileUploadToDB.Models
{
    public class MyViewModel
    {
        [Required]
        [DisplayName("Select File to Upload")]
        public IEnumerable<HttpPostedFileBase> File { get; set; }  //2nd change
    }

    public class FileUploadDBModel
    {
        public int Id { get; set; }
        public string FileName { get; set; }
        public byte[] File { get; set; }
    }
}

Web.config

<add name="FileUploadDBContext" connectionString="Data Source=(localdb)\v11.0; Initial Catalog=DelContext-20140305142934; Integrated Security=True; MultipleActiveResultSets=True; AttachDbFilename=|DataDirectory|DelContext-20140305142934.mdf"
      providerName="System.Data.SqlClient" />