c# - jqueryでドロップダウンリストから値を取得するにはどうすればよいですか

Question

コントローラーコード:

private UBADBEntities db = new UBADBEntities();

    public ActionResult Index()
    {
        ViewBag.Pos1 = new SelectList(db.Positions, "posID", "posName");
        ViewBag.Pos2 = new SelectList(db.Positions, "posID", "posName");
        var applications = db.Applications.Include("Position").Include("Position1");
        return View(applications);
    }

    [HttpPost]
    public ActionResult Index(int id, int listPos1, int listPos2)
    {
        var applicationQuery =
            from app in db.Applications
            where app.CandidateID == id
            select app;

        ViewBag.Pos1 = new SelectList(db.Positions, "posID", "posName", listPos1);
        ViewBag.Pos2 = new SelectList(db.Positions, "posID", "posName", listPos2);

        foreach (var application in applicationQuery)
        {
            if (application.CandidateID == id)
            {
                application.Pos1 = listPos1;
                application.Pos2 = listPos2;
            }
        }

        db.SaveChanges();
        return View(db.Applications.ToList());
    }

コードを表示:

<div id="firstPos-@item.CandidateID.ToString()" class="show">@Html.DisplayFor(modelItem => item.Position.posName)</div>
<div id="listPos1-@item.CandidateID.ToString()" class="invisible">@Html.DropDownList("Pos1", String.Empty)</div>

@Html.DisplayFor(modelItem => item.Position1.posName)

<div id="listPos2-@item.CandidateID.ToString()" class="invisible">@Html.DropDownList("Pos2", String.Empty)</div>

JS スクリプト:

function ShowEdit(par) {
        $("#listPos1-" + par).attr("class", "show");
        $("#secondPos-" + par).attr("class", "invisible");
        $("#listPos2-" + par).attr("class", "show");
        $("#btnEdit-" + par).attr("class", "btn-toolbar text-center btn-group btn hide");
        $("#btnSave-" + par).attr("class", "btn-toolbar text-center btn-group btn show");
    }
    function SaveEdit(par) {
        $("#listPos1-" + par).attr("class", "invisible");
        $("#secondPos-" + par).attr("class", "show");
        $("#listPos2-" + par).attr("class", "invisible");
        $("#btnEdit-" + par).attr("class", "btn-toolbar text-center btn-group btn show");
        $("#btnSave-" + par).attr("class", "btn-toolbar text-center btn-group btn hide");

        var _listPos1 = $("#listPos1-" + par).val();
        var _listPos2 = $("#listPos2-" + par).val();
        var url = '@Url.Action("Index","Application")';
        $.post(url, { id: par listPos1: _listPos1, listPos2: _listPos2 }, function (data) {
            $("#divResult").html(data);
        });
    }