Html.ValidationMessageFor custom message always show - asp.net-mvc

Question

#Html.ValidationMessageFor(model => model.DeliverySchedule.d_date, "Please fill up.", new { #class = "text-danger" })
for my validation. However it keep showing on page load.
after adding the css below. it disappear on first load but when i submit the form with empty field. The message does not come out.
.field-validation-valid
{display: none;}
Javascript ref also added
<script src="~/Scripts/jquery.validate.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
Controller
public ActionResult ArrangeDelivery() {
var list = service.GetNotDeliveryScheduleList();
return View(list);
}
[HttpPost]
public ActionResult ArrangeDelivery(OrderViewModel model)
{
var result = service.SetDeliverySchedule(model);
if (result==true)
{
return RedirectToAction("ArrangeDelivery");
}
var list = service.GetNotDeliveryScheduleList();
return View(list);
}
HTML
<div class='input-group date' id='datetimepicker2'>
#Html.EditorFor(model => model.DeliverySchedule.d_date, new { htmlAttributes = new { #class = "form-control bootdatepicker" } })
#Html.ValidationMessageFor(model => model.DeliverySchedule.d_date, "Please fill up.", new { #class = "text-danger" })
<span class="input-group-addon">
<span class="glyphicon glyphicon-calendar"></span>
</span>
</div>
View model
public class OrderViewModel
{
public OrderViewModel()
{
DeliveryScheduleList = new List<DeliverySchedule>();
DeliveryPartList = new List<DeliveryPart>();
}
public List<DeliverySchedule> DeliveryScheduleList { get; set; }
public DeliverySchedule DeliverySchedule { get; set; }
public List<DeliveryPart> DeliveryPartList { get; set; }
}
Actual Model with DB first
public partial class DeliverySchedule
{
public long ID { get; set; }
public Nullable<long> DL_ID { get; set; }
public Nullable<System.DateTime> datum { get; set; }
public Nullable<System.DateTime> zeit { get; set; }
public string customer_id { get; set; }
public string customer { get; set; }
public string area { get; set; }
public string address_1 { get; set; }
public string address_2 { get; set; }
public string postal { get; set; }
public string person_look_for { get; set; }
public string contact_look_for { get; set; }
public string PO_Number { get; set; }
public string staff { get; set; }
public string invoice { get; set; }
public string service { get; set; }
public string remarks { get; set; }
public string d_type { get; set; }
public string d_arranged { get; set; }
public string i_return { get; set; }
public string d_done { get; set; }
public Nullable<System.DateTime> d_date { get; set; }
public string d_time { get; set; }
public string d_by { get; set; }
public Nullable<int> DO_Number { get; set; }
}