MVC 5 Retrieving Data from SQL Server - asp.net-mvc

Question

Could somebody please explain how I retrieve a simple set of records from a SQL Server 2012 database to display on an ASP.NET page? I have tried following some tutorials but I am missing something and I cant see the wood for the trees.
I have a connection string in the web.config file:
<add name="DefaultConnection"
connectionString="Data Source=MY-LAPTOP;Initial Catalog=Test;Integrated Security=True"
providerName="System.Data.SqlClient" />
I have a class called Navigation.cs which is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WebApplication1.Models
{
public partial class Navigation
{
public int navigation_ID { get; set; }
public string title_TV { get; set; }
public Nullable<int> position_IV { get; set; }
public bool main_BT { get; set; }
public string url_TV { get; set; }
}
}
I have a Shared/_layout.cshtml page which has the following code:
#model List<WebApplication1.Models.Navigation>
#foreach (var item in Model) {
<li>#Html.DisplayFor(modelItem => item.title_TV)</li>
}
I also have a controller called HomeController.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace WebApplication1.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
}
}
I get the following error
An exception of type 'System.NullReferenceException' occurred in App_Web_wqu1n0vj.dll but was not handled in user code.
I have created a class called TestEntities.cs which is as follows:
using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
namespace WebApplication1.Models
{
public partial class TestEntities : DbContext
{
public TestEntities()
: base("name=DefaultConnection")
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
public virtual DbSet<Navigation> Navigations { get; set; }
}
}
Any help would be much appreciated :-)