//Controller
 public ActionResult Register()
        {
            RegisterViewModel viewModel = new RegisterViewModel
            {
                Districts = _unitOfWork.DistrictRepository.GetAll(),
            };
            return View(viewModel);
        }
//View
@Html.DropDownListFor(m => m.DistrictId, new SelectList(Model.Districts, "District_ID", "Name"), new { @class = "browser-default" })