How can I rebind the drowdownlist in Edit page MVC

Question

Hello everyone,

 

 I am working on MVC 5, there I have Viewmodel Class ' PartnersVM '.

public class PartnersVM
   {
       public List<CountryVM> listCountry { get; set; }
       public PartnerVM listPartnerVM { get; set; }
   }

public class CountryVM
   {
       public int idCountry { get; set; }
       public string countries_name { get; set; }
   }

public class PartnerVM
   {
     public string ServiceDistricts { get; set; }
     public string ServiceStates { get; set; }
    }

And this is ActionResult Get method.

[HttpGet]
public ActionResult PremiumUserRegistration()
       {
         PartnersVM objcountrymodel = new PartnersVM();
          objcountrymodel.listCountry = new List<CountryVM>();
                       objcountrymodel.listCountry = objPartnerBIL.ShowCountries().Select(item => new CountryVM
                       {
                           idCountry = item.idCountry,
                           countries_name = item.countries_name
                       }).ToList();
return View("PremiumUserRegistration", objcountrymodel);
        }

 After calling this actionresult now binding list of countries. And the dropdown onchage calling a jscript function for bind below dropdowns also.

 

View:

@Html.DropDownListFor(model => model.listCountry, new SelectList(Model.listCountry, "idCountry", "countries_name"), "Select", new { @class = "form-control ", @id = "ddlcountries", @onchange = "return getuserstate.search(this.value)" })


@Html.DropDownListFor(model => model.listPartnerVM.ServiceStates, Enumerable.Empty<SelectListItem>(), "Select Country", new { @id = "ddlstate", @class = "form-control ", @onchange = "return getdistricts.search(this.value)" })


@Html.DropDownListFor(model => model.listPartnerVM.ServiceDistricts, Enumerable.Empty<SelectListItem>(), "Select State", new { @id = "ddlDistrict", @class = "form-control " })

 Now, all are working fine. But the problem is, I can not rebind those drowdown list while moving on edit page. Here Add/Edit page is one. How can I rebind the dropdownlist?

 

Please help me...