@Html.AutoCompleteFor(model => model.Id, new PeopleDatalist())

@Html.DatalistFor(model => model.Id, new PeopleDatalist())

@Html.DatalistFor(model => model.Ids, new PeopleDatalist())

document.addEventListener('datalistselect', function (e) {
    var data = e.detail.data;

    for (var i = 0; i < data.length; i++) {
        data[i].Label = data[i].Name[0] + '. ' + .data[i].Surname;
    }
});

public class HomeController : Controller
{
    private DbContext Context { get; }

    public HomeController(DbContext context)
    {
        Context = context;
    }

    [HttpGet]
    public JsonResult AllPeople(DatalistFilter filter)
    {
        PeopleDatalist datalist = new PeopleDatalist(Context) { Filter = filter };

        return Json(datalist.GetData(), JsonRequestBehavior.AllowGet);
    }
}

public class PeopleDatalist : MvcDatalist<Person>
{
    private DbContext Context { get; }

    public PeopleDatalist(DbContext context)
    {
        Context = context;
    }
    public PeopleDatalist()
    {
        Url = "AllPeople";
    }

    public override IQueryable<Person> GetModels()
    {
        return Context.Set<Person>();
    }
}