c# - Cannot Connect to Database in another Layer

Question

I have spent some time getting my Data Access Layer (DAL) setup with Repositories and Entity Framework. The DAL is a separate project (Class library project) within the same Solution as my ASP.Net MVC 4 application. However I am not able to access the Database create from the ASP.Net MVC 4 application.

I get the following error

Cannot attach the file 'H:\Dropbox\TechCenter\Visual Studio 2012\Projects\TxValueCardProject\TxValueCardProject.Presentation\App_Data\TxValueCardProject.DataAccessLayer.TxDBContext.mdf' as database 'TxValueCardProject.DataAccessLayer.TxDBContext'.

In my DAL I have the POCO class:

public class Customer
    {
        public int CustomerId { get; set; }
        public int RetailerId { get; set; }
        public string  CustomerName { get; set; }
        public string CustomerEmail { get; set; }
        public int PointsBalance { get; set; }
        public decimal CashBalance { get; set; }

        public ICollection<LoyaltyCard> LoyaltyCards { get; set; }
        public virtual Retailer Retailer { get; set; }
    }

And the DBContext Class

public class TxDBContext:DbContext
    {
        public DbSet<Customer> Customer { get; set; }

     }

And this Repository

  public class CustomerRepository : IRepository<Customer>
    {
        TxDBContext context = new TxDBContext();

        public IQueryable<Customer> All
        {
            get { return context.Customers; }
        } 
    }

With this setup, everything works fine in the DAL, all my Unit Test pass, and I can see the DB from SQL MS. Except when I switch to the ASP.Net MVC 4 project and appropriate references and Usings and everything build successfully and then I try a simple DB access like so, it fails

namespace TxValueCardProject.Presentation.Controllers
{
    public class CustomerController : Controller
    {
       public ViewResult Index()
        {
            var custRepo = new CustomerRepository();
            var customersInDb = custRepo.All;
            return View(customersInDb);
        }

The View is a simple loop statement @foreach (var item in Model)

Please help, what am I missing or doing wrong?