Why am I getting this "Invalid object name 'dbo.*'" error with MVC4?

I get this error:

Invalid object name 'dbo.ImageMetas'.

On this line:

return View(db.Images.ToList());

Where my database context looks like this:

public class GalleryContext : DbContext
{
    public GalleryContext()
        : base("DefaultConnection")
    {
    }

    public DbSet<ImageMeta> Images { get; set; }
    public DbSet<ImageFile> ImageFiles { get; set; }
}

And my model:

public class ImageMeta
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public UserProfile User { get; set; }
    public string Name { get; set; }
    public virtual ICollection<ImageFile> Files { get; set; } 
}

It's a brand new MVC4 project. I wrote the models first, then auto-generated the controller.

I inspected the database, and indeed the table is missing.

I was under the impression that it would auto-create the table for me though; as this tutorial suggests.

So why isn't it doing that?

Okay, if I add a connection string named after my context (and remove the base constructor), it works now. Why can't I use the DefaultConnection, then?

<add name="GalleryContext"
   connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\gallery.mdf;Integrated Security=True"
   providerName="System.Data.SqlClient"
/>