Loading DropDownList in MVC and Webservice

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Model Class~~StdModel.cs

public class StdModel
    {
        public int Opt { get; set; }
        public int StdID { get; set; }
        [Required(ErrorMessage="Please Enter RollNo")]
        public string RollNo { get; set; }


        [Required(ErrorMessage = "Please Enter StudentName")]
        public String StudentName { get; set; }
       
        [Required(ErrorMessage = "Please Enter Religion")]
        public string Religion { get; set; }


        [Required(ErrorMessage = "Please Enter Age")]
        public int Age { get; set; }

        [Required(ErrorMessage = "Please Enter Class")]
        public string Class { get; set; }

        [Required(ErrorMessage = "Please Enter FatherName")]
        public string FatherName { get; set; }

        public List<GridStdModel> ListStdModel = new List<GridStdModel>();


    }



Controller~~StudentEntryController


        public JsonResult LoadDDL()
        {
            DataTable dt = new DataTable();
            StdModel Std = new StdModel();

            Std.Opt = 2;

            DBcode DB = new DBcode();
            dt=DB.Select(Std);

            List<StdModel> ListStdName = new List<StdModel>();
          
            StdModel StM = new StdModel();

              for(int i=0;i<dt.Rows.Count;i++)
              {
                  StM = new StdModel();

                  StM.StdID = Convert.ToInt32(dt.Rows[i]["StdID"]);
                  StM.StudentName = Convert.ToString(dt.Rows[i]["StudentName"]);
                 
                  ListStdName.Add(StM);

              }

              return Json(new SelectList(ListStdName,"StdID","StudentName"));
        }




View Page:

@model SMS.Models.StdModel
@{
    ViewBag.Title = "Student";
}

@Scripts.Render("~/bundles/jquery");


<script type="text/javascript">
    $(document).ready(function () {
        $("#ddl").empty();
        $("#ddl").append($("<option></option>").val("").html("Select  Group Name"));

        $.ajax({
            type: 'POST',
            url: '@Url.Action("LoadDDL","StudentEntry")',
            data: {},
            success: function (data) {
                $.each(data, function (i, data) {
                    $("#ddl").append('<option value="' + data.Value + '">' +
                         data.Text + '</option>');
                });
            },
            error: function (ex) {
                alert('Failed to retrieve.' + ex);
            }

        });

    });

</script>

<h2>Student Entry</h2>


@using (Html.BeginForm())
{
   
    @Html.ValidationSummary(true)
    <table border="1" width="100%" height="200px">
        <tr>
            <td align="center">
                @Html.DropDownListFor(m => m.StdID, Enumerable.Empty<SelectListItem>(), "ID", new {@id="ddl" })


            </td>

        </tr>

    </table>
}


Result:





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