asp.net core textbox autocomplete with jquery and json

Question

I am trying to have a textbox with autocomplete using an example from here https://www.iaspnetcore.com/blog/blogpost/577e6e3784cd461ac830e4a9. However, I get no results. My code below

 

<div class="col-md-1">
                <select id="ConClass" class="form-control border-danger" asp-items="@Model.SelectControlClass">
                    <option value="">-- Select --</option>
                </select>
                <span asp-validation-for="RiskAssessmentSecondary.ConClass" class="text-danger"></span>
                <input  asp-for="RiskAssessmentSecondary.ConClass" id="conClass" />
            </div>
            <div class="col-md-2">
                <input id="txtControl" type="text" class="form-control" asp-for="RiskAssessmentSecondary.ConDetail" />
                <span asp-validation-for="RiskAssessmentSecondary.ConDetail" class="text-danger"></span>
            </div>

 

$(function () {
            $("#ConClass").on("change", function () {

                var data = $("#ConClass :selected").text();
                $("#conClass").val(data);
                $("#txtControl").autocomplete({
                    source: function (request, response) {

                        $.getJSON(`?handler=AutoComplete`, request, function (data) {
                            response($.map(data, function (item) {
                                return {
                                    value: item + ""
                                }
                            }))
                        })
                    }
                });
            });
        });

  

public JsonResult OnGetAutoComplete(string id)
        {
            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
            var orgid = _context.UsersData.Where(a => a.Id == userId).Select(a => a.OrgID).SingleOrDefault();

            var conDetail = (from a in _context.HazardSources.Where(s => s.OrgID == orgid)
                             join b in _context.HazardClasses on a.IdHS equals b.IdHS into Temp1
                             from c in Temp1
                             join d in _context.HazardDetails on c.IdHC equals d.IdHC into Temp2
                             from e in Temp2
                             join f in _context.ControlClasses.Where(s => s.ConClass.ToLower().Contains(id.ToLower())) on e.IdH equals f.IdH into Temp3
                             from g in Temp3 select new
                             {

                                 value = g.ConDetail

                             }).Distinct().ToList();


            return new JsonResult(conDetail);
        }