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@model WebCourse.Models.Customemployee2@{Layout = null;}<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width" /><title>Edit</title><script src="~/scripts/jquery-1.10.2.js"></script><script>$(function () {$("#CountryId").change(function () {$("#citylist").empty();// alert("error");var x = $(this).val();$.ajax({url: "/empcourse/getcitybyid",data: { id: x },success:function(res){$.each(res, function (i, e) {if (e.Id == $("#cityidhidden").val()){$("#citylist").append("<option selected value='" + e.Id + "'>" + e.CityName + "<option>")}else{$("#citylist").append("<option value='" + e.Id + "'>" + e.CityName + "<option>")}});}});});$("#CountryId").change();$("#citylist").change(function () {$("#districtlist").empty();// alert("error");var y = $(this).val();$.ajax({url: "/empcourse/getdistrictbyid",data: { id: y },success: function (res) {$.each(res, function (i, e) {if (e.Id == $("#disthidden").val()) {$("#districtlist").append("<option selected value='" + e.Id + "'>" + e.DistrictName + "<option>")}else{$("#districtlist").append("<option value='" + e.Id + "'>" + e.DistrictName + "<option>")}});}});});$("#citylist").change();});</script></head><body><div>@using (Html.BeginForm()){<div><input type="hidden" value="@ViewBag.Cityid" id="cityidhidden" /><input type="hidden" value="@ViewBag.dist" id="disthidden" />Name:@Html.TextBoxFor(a => a.Name)<br />Country:@Html.DropDownList("CountryId")<br />City:<select id="citylist" name="CityId"></select><br />District:<select id="districtlist" name="DistrictId"></select><br /><input type="submit" /></div>}</div></body></html>in Edit function in controller empcoursepublic class empcourseController : Controller{mycourseEntities db = new mycourseEntities();// GET: empcoursepublic ActionResult Edit(int id){Employee old = db.Employees.Find(id);if (old != null){// country and city working//district not workingint countryid = old.Destrict.City.Country.Id;var vm = new Customemployee2();vm.Name = old.Name;ViewBag.CountryId = new SelectList(db.Countries.ToList(), "Id", "CountryName",countryid);ViewBag.Cityid = old.Destrict.City.Id;ViewBag.dist = old.DistrictId;return View(vm);}//getcitybyid retrieve city it call in ajax in jquery and it workingpublic JsonResult getcitybyid(int id){db.Configuration.ProxyCreationEnabled = false;return Json(db.Cities.Where(a => a.CountryId == id), JsonRequestBehavior.AllowGet);}//getdistrictbyid retrieve district it call in ajax in jquery and it workingpublic JsonResult getdistrictbyid(int id){db.Configuration.ProxyCreationEnabled = false;return Json(db.Destricts.Where(a => a.CityId == id), JsonRequestBehavior.AllowGet);}}in model Customemployee2public class Customemployee2{public string Name { get; set; }public int DistrictId { get; set; }}}