How after choosing trainsnumber pass to controller countvagon of this choosed trans and get in view dropdownlist

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ASP.NET

MVC

jQuery

AngularJs

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Hi.I am new here.I know little angular,asp.net mvc ,jquery,json but cannot use them and combine in one project.So I have dropdown list-contry,trans Name,vagon Name.I want choose trainsName,after that find in database count Vagon of this choosen Train.And show dropdown list this vagon.

As I understand I need to pass from View to Controller which train is choosen,then find from database CountVagon(for example Train-T0000000023 has 5 vagon) And pass from Controller to View DropdownList(which consist-Vagon1,Vagon2,Vagon3,Vagon4,Vagon5).

Please explain me,if somebody can solve that.I have searched many time but couldnt do exatly what I wanted.Thank you :))

What I have tried:

<script type="text/javascript">
    $(document).ready(function () {
        $('#Name').change(function () {
         var TrainID= $('#Name :selected').val();

        });

    });
    
</script>

<h2>Buy</h2>

<div class="table table-bordered">

 
    
    <div class="filter">

        @Html.DropDownListFor(x => x.City, (SelectList)ViewBag.TrainsCity)

        @Html.DropDownListFor(x => x.Name, (SelectList)ViewBag.TrainsName)

        @Html.DropDownListFor(x => x.VagonCount, (List<SelectListItem>)ViewBag.TrainsVagon)

    </div>
       



ANd Controller

  public ActionResult Buy()
        {
            ViewBag.TrainsName = new SelectList(db.Trains, "ID", "Name");
            ViewBag.TrainsCity = new SelectList(db.Trains, "ID", "City");

            //which train or where choosed angular will receive and get the number of train by using lambda expression and pass to the methods
            //I need to pass countVagon instead of 7
            ViewBag.TrainsVagon = PopulateCountVaqon(7);
            PopulateCountVaqon(7);
            IEnumerable<TrainReqistration.Models.Train> trains = db.Trains;
            return View();
        }

        List<SelectListItem>  PopulateCountVaqon(int count)
        {
            List<SelectListItem> countVagon = new List<SelectListItem>();
            for(int i = 0; i <= count; i++)
            {
                countVagon.Add(new SelectListItem() { Value = i.ToString(), Text = "Vaqon " + i });
            }

            return countVagon;
        }