Trying To Use The UserManager.IsInRoleAsync() Function In My Controller

namespace parentnchild.Controllers
{
    public class InitialController : Controller
    {
        private readonly ApplicationDbContext _db;
        private readonly UserManager<IdentityUser> _userManager;

        public InitialController(ApplicationDbContext context, UserManager<IdentityUser> userManager)
        {
            _db = context;
            _userManager = userManager;
        }

        /* GET METHOD */
        /* This is the initial view in our flow of registering a property as a parent. It just displays the search input box without any other information on the page */
        public IActionResult InitialView()
        {

            if (_userManager.IsInRoleAsync(User, "NORTH"))
            {
                List<LIS> results = _db.LIS.Where(s => s.Sector.Contains("NORTH")).ToList();
                return View(results);
            }
            else if (_userManager.IsInRoleAsync(User, "SOUTH"))
            {

                List<LIS> results = _db.LIS.Where(s => s.Sector.Contains("SOUTH")).ToList();
                return View(results);
            }
            else if (_userManager.IsInRoleAsync(User, "EAST"))
            {

                List<LIS> results = _db.LIS.Where(s => s.Sector.Contains("EAST")).ToList();
                return View(results);
            }
            else if (_userManager.IsInRoleAsync(User, "WEST"))
            {

                List<LIS> results = _db.LIS.Where(s => s.Sector.Contains("WEST")).ToList();
                return View(results);
            }
            else
            {
                List<LIS> results = _db.LIS.ToList();
                return View(results);
            }

        }
}