public List<Advertisement> GetLastetAdvertisement()
    {
        DemoContext _context = new DemoContext();
        using (_context)
        {
            return (from adv in _context.Advertisements
                    .Include(a => a.SubCatagory.Catagory)
                    .Include(a => a.City.Province.Country)
                    .Include(a => a.User)
                    .Include(a => a.Images)
                    .Include(a => a.Status)
                    .Include(a => a.Type)
                    .OrderBy(x => x.PostedOn)

                    select adv
                    ).Take(12).ToList();
        }
    }