<div class="col-xs-1" >
    <label class="control-label" for="selectError">Customer</label>
</div>
<div class="col-xs-2">
    <select id="ddlCustomers"  data-rel="chosen" style="width: 180px">
    </select>
</div>

Sir I am working on MVC 4 and i have implement custom admin template so now i am using your code to bind dropdwn list but its not working so i was remove data-rel="chosen" from my dropdwn after that it is working but its miss dropdown search behaviour

   <!-- amar start -->
   <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
   <script type="text/javascript">
       $(function () {
           var ddlCustomers = $("#ddlCustomers");
           ddlCustomers.empty().append('<option selected="selected" value="0" disabled = "disabled">Loading.....</option>');
           $.ajax({
               type: "POST",
               url: "/Acoount/bindcustomer",
               data: '{}',
               contentType: "application/json; charset=utf-8",
               dataType: "json",
               success: function (response) {
                   ddlCustomers.empty().append('<option selected="selected" value="0">Please select</option>');
                   $.each(response, function () {
                       ddlCustomers.append($("<option></option>").val(this['Value']).html(this['Text']));
                   });
               },
               failure: function (response) {
                   alert(response.responseText);
               },
               error: function (response) {
                   alert(response.responseText);
               }
           });
       });
   </script>
   <!-- amar end-->

controller

        [HttpPost]
        public JsonResult bindcustomer()
        {
            AccountContext obj1 = new AccountContext();
            List<SelectListItem> customer = new List<SelectListItem>();
 
            for (int i = 0; i < 1; i++)
            {
                customer.Add(new SelectListItem
                {
                    Value =Convert.ToString( obj1.customer.ToList()[i].Code),
                    Text = obj1.customer.ToList()[i].name
                });
            }
 
            return Json(customer);
        }

https://www.aspsnippets.com/Articles/Populate-Bind-DropDownList-using-jQuery-AJAX-and-JSON-in-ASPNet-MVC.aspx

this article code i am using for bind dropdownlist