ASP.NET

Private Sub SearchCustomers()
      Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
      Dim startDate As DateTime
      Dim EndDate As DateTime
      Using con As New SqlConnection(constr)

          Using cmd As New SqlCommand()

              Dim sql As String = "spGetLogs"
              cmd.CommandType = CommandType.StoredProcedure
              cmd.Parameters.AddWithValue("@uuid", suuid.Text)
              cmd.Parameters.AddWithValue("@callerlist", caller_list_id.Text)
              cmd.Parameters.AddWithValue("@phone", phonenumber.Text)
              If DateTime.TryParseExact(date_start.Text, "yyyy-MM-dd HH:mm:ss", Nothing, System.Globalization.DateTimeStyles.None, startDate) Then
                  cmd.Parameters.AddWithValue("@start", startDate)
              Else
                  cmd.Parameters.AddWithValue("@start", DBNull.Value)
              End If
              If DateTime.TryParseExact(date_end.Text, "yyyy-MM-dd HH:mm:ss", Nothing, System.Globalization.DateTimeStyles.None, EndDate) Then
                  cmd.Parameters.AddWithValue("@Endd", EndDate)
              Else
                  cmd.Parameters.AddWithValue("@Endd", DBNull.Value)
              End If
              cmd.Parameters.AddWithValue("@calltype", call_type.SelectedValue)
              'Response.Write(sql)
              'Response.End()
              cmd.CommandText = sql
              cmd.CommandTimeout = 600
              cmd.Connection = con
              Using sda As New SqlDataAdapter(cmd)
                  Dim dt As New DataTable()
                  sda.Fill(dt)
                  gvCustomers.DataSource = dt
                  gvCustomers.DataBind()

              End Using
          End Using
      End Using
  End Sub

In the first DropdownList should display the Countries and in the second should display Cities based on the Country like .. USA then display just cities in USA . well i am getting undefined in dropdown city the Question is why i am getting always undefined in City dropDown list ?

here is countrol :
<pre> public ActionResult Index()
        {
            Details();
            return View();
        }

        public void Details (
        {
            var model = db.GetUniversities().ToList();
            List<SelectListItem> li = new List<SelectListItem>();
            li.Add(new SelectListItem { Text = "Please select Country",Value="0"});
            foreach (var item in model)
            {
                li.Add(new SelectListItem { Text = item.Country, Value = item.Id.ToString()});
                ViewBag.state = li;
            }
        }
        [HttpPost]
        public JsonResult GetCity (int id)
        {
            var ddlCity = db.GetUniversities().Where(x => x.Id == id).ToList();
            List<SelectListItem> licities = new List<SelectListItem>();

            //licities.Add(new SelectListItem { Text = "--Select City--", Value = "0" });

            if (ddlCity != null)
            {
                foreach (var x in ddlCity)
                {
                    licities.Add(new SelectListItem { Text = x.City, Value = x.Id.ToString() });
                }
            }
            return Json(new SelectList(licities, "Text", "Value"));

        }

<div class="form-group">
    @Html.LabelFor(model => model.Country, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.DropDownListFor(model => model.Country, ViewBag.state as List<SelectListItem>, new { style = "width: 200px;" })

        @Html.ValidationMessageFor(model => model.Country, "", new { @class = "text-danger" })
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(model => model.City, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.DropDownListFor(model => model.City, new SelectList(string.Empty, "Value", "Text"), "--Select City--", new { style = "width:200px" })

        @Html.ValidationMessageFor(model => model.City, "", new { @class = "text-danger" })

$(document).ready(function () {

        $("#Country").change(function () {
            $("#City").empty();
            $.ajax({
                type: 'POST',
                url: '@Url.Action("GetCity")',
                dataType: 'json',
                data: { id: $("#Country").val() },
                success: function (city) {

                    $.each(city, function (i, city) {
                        $("#City").append('<option value="' + city.Value + '">'+ city.Text + '</option>');
             
                    });
                },
                error: function (ex) {
                    alert('Failed.' + ex);
                }
            });
            return false;
        })
    });

WHERE 1 = 1
 AND ((@uuid IS NULL OR qp.uuid Like '%' + @uuid + '%')
 AND (@callerlist IS NULL OR  qp.call_list_id Like '%' + @callerlist + '%')
 AND (@phone IS NULL OR cl.phone_number Like '%' + @phone + '%')
 AND (@start IS NULL OR startttime >= @start)
 AND (@Endd IS NULL OR endtime <= @Endd)
 AND (@calltype IS NULL OR c.id Like '%' + @calltype + '%')
 AND cl.phone_number IS NOT NULL)

<asp:TextBox id="date_start" style="width:150px;" class="form-control alignleft" runat="server" />

<asp:TextBox id="date_end" style="width:150px;" class="form-control alignleft" runat="server" />

Private Sub SearchCustomers()
     Dim constr As String = ConfigurationManager.ConnectionStrings("ppmtest").ConnectionString

     Using con As New SqlConnection(constr)

         Using cmd As New SqlCommand()

             Dim sql As String = "spGetLogs"
             cmd.CommandType = CommandType.StoredProcedure
             cmd.Parameters.AddWithValue("@uuid", suuid.Text)
             cmd.Parameters.AddWithValue("@callerlist", caller_list_id.Text)
             cmd.Parameters.AddWithValue("@phone", phonenumber.Text)
             cmd.Parameters.AddWithValue("@start", date_start.Text)
             cmd.Parameters.AddWithValue("@Endd", date_end.Text)
             cmd.Parameters.AddWithValue("@calltype", call_type.SelectedValue)
             'Response.Write(sql)
             'Response.End()
             cmd.CommandText = sql

             cmd.Connection = con
             Using sda As New SqlDataAdapter(cmd)
                 Dim dt As New DataTable()
                 sda.Fill(dt)
                 gvCustomers.DataSource = dt
                 gvCustomers.DataBind()

             End Using
         End Using
     End Using
 End Sub