C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace WebApplication1.Models
{
    public class CitySelectorViewModel
    {
        public CitySelectorViewModel()
        {
            CitiesList = new List<CityViewModel>();
        }

        [Display(Name = "City")]
        [Required]
        public int SelectedCity { get; set; }
        public IList<CityViewModel> CitiesList { get; set; }
    }

    public class CityViewModel
    {
        public int CityId { get; set; }
        public string CityName { get; set; }
        public string CountryName { get; set; }
    }
}

Model

​x
 
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
​
namespace WebApplication1.Models
{
    public class CitySelectorViewModel
    {
        public CitySelectorViewModel()
        {
            CitiesList = new List<CityViewModel>();
        }
​
        [Display(Name = "City")]
        [Required]
        public int SelectedCity { get; set; }
        public IList<CityViewModel> CitiesList { get; set; }
    }
​
    public class CityViewModel
    {
        public int CityId { get; set; }
        public string CityName { get; set; }
        public string CountryName { get; set; }
    }
}

@model WebApplication1.Models.CitySelectorViewModel

@{
    Layout = null;
}

<!DOCTYPE html>
<html>
<head>
    <script src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script>
    <title>Test</title>
    <script>
        $(document).ready(function () {

            var cityDropdown = $("#cityDropdown");

            cityDropdown.change(function () { //when dropdown changes
                $("#countryTextbox").val(cityDropdown.find(':selected').data('country'));
            });

            cityDropdown.change(); //initial load

        });
    </script>
</head>
<body>

@using (Html.BeginForm(null, null, FormMethod.Post))
{
    <div>
        @Html.LabelFor(model => model.SelectedCity):
        <div>
            <select id="cityDropdown" name="@Html.NameFor(x => x.SelectedCity)">
                <option value=""></option>
                @foreach (var city in Model.CitiesList)
                {
                <option value="@city.CityId" data-country="@city.CountryName"@if(Model.SelectedCity == city.CityId){<text> selected="selected" </text>}>@city.CityName</option>
                }
            </select>
            @Html.ValidationMessageFor(model => model.SelectedCity)
        </div>
    </div>
    
    <br/>
    
    <div>
        Country:
        <div>
            <input id="countryTextbox" type="text" disabled />
        </div>
    </div>
    
    <br/>
    
    <input type="submit" value="Submit" />
}

</body>
</html>

View

 
@model WebApplication1.Models.CitySelectorViewModel
​
@{
    Layout = null;
}
​
<!DOCTYPE html>
<html>
<head>
    <script src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script>
    <title>Test</title>
    <script>
        $(document).ready(function () {
​
            var cityDropdown = $("#cityDropdown");
​
            cityDropdown.change(function () { //when dropdown changes
                $("#countryTextbox").val(cityDropdown.find(':selected').data('country'));
            });
​
            cityDropdown.change(); //initial load
​
        });
    </script>
</head>
<body>
​
@using (Html.BeginForm(null, null, FormMethod.Post))
{
    <div>
        @Html.LabelFor(model => model.SelectedCity):
        <div>
            <select id="cityDropdown" name="@Html.NameFor(x => x.SelectedCity)">
                <option value=""></option>
                @foreach (var city in Model.CitiesList)
                {
                <option value="@city.CityId" data-country="@city.CountryName"@if(Model.SelectedCity == city.CityId){<text> selected="selected" </text>}>@city.CityName</option>
                }
            </select>
            @Html.ValidationMessageFor(model => model.SelectedCity)
        </div>
    </div>
    
    <br/>
    
    <div>
        Country:
        <div>
            <input id="countryTextbox" type="text" disabled />
        </div>
    </div>
    
    <br/>
    
    <input type="submit" value="Submit" />
}
​
</body>
</html>
​
​

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }


        [HttpGet]
        public ActionResult Test()
        {
            var viewModel = new CitySelectorViewModel();
            FillCities(viewModel);
            return View(viewModel);
        }

        [HttpPost]
        public ActionResult Test(CitySelectorViewModel viewModel)
        {
            FillCities(viewModel);
            return View(viewModel);
        }

        private void FillCities(CitySelectorViewModel viewModel)
        {
            viewModel.CitiesList.Add(new CityViewModel { CityId = 1, CityName = "Dublin", CountryName = "Ireland" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 2, CityName = "London", CountryName = "England" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 3, CityName = "Paris", CountryName = "France" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 4, CityName = "New York", CountryName = "United States" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 5, CityName = "Rome", CountryName = "Italy" });
        }
    }
}

Controller

 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using WebApplication1.Models;
​
namespace WebApplication1.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }
​
        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";
​
            return View();
        }
​
        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";
​
            return View();
        }
​
​
        [HttpGet]
        public ActionResult Test()
        {
            var viewModel = new CitySelectorViewModel();
            FillCities(viewModel);
            return View(viewModel);
        }
​
        [HttpPost]
        public ActionResult Test(CitySelectorViewModel viewModel)
        {
            FillCities(viewModel);
            return View(viewModel);
        }
​
        private void FillCities(CitySelectorViewModel viewModel)
        {
            viewModel.CitiesList.Add(new CityViewModel { CityId = 1, CityName = "Dublin", CountryName = "Ireland" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 2, CityName = "London", CountryName = "England" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 3, CityName = "Paris", CountryName = "France" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 4, CityName = "New York", CountryName = "United States" });
            viewModel.CitiesList.Add(new CityViewModel { CityId = 5, CityName = "Rome", CountryName = "Italy" });
        }
    }
}

View in Full Screen

Unhandled exception. System.TypeInitializationException: The type initializer for 'System.Data.Entity.DbContext' threw an exception.
---> System.TypeInitializationException: The type initializer for 'Z.EntityFramework.Classic.EntityFrameworkManager' threw an exception.
---> System.TypeInitializationException: The type initializer for '' threw an exception.
---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

File name: 'System.Configuration.ConfigurationManager, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
   at Z.Expressions.CompilerManager..cctor()
   at Z.Expressions.CompilerManager.LoadEntityFrameworkClassicConfiguration()
   at Z.Expressions.ExceptionMessage.ThrowLicenseException()
   at ..cctor()
   --- End of inner exception stack trace ---
   at .()
   at Z.EntityFramework.Classic.EntityFrameworkManager..cctor()
   --- End of inner exception stack trace ---
   at Z.EntityFramework.Classic.EntityFrameworkManager.Initialize()
   at System.Data.Entity.DbContext..cctor()
   --- End of inner exception stack trace ---
   at System.Data.Entity.DbContext..ctor(String nameOrConnectionString)
   at Program.EntityContext..ctor()
   at Program.GenerateData()
   at Program.Main()
Command terminated by signal 6

Last Run:	2:37:13 pm
Compile:	0.593s
Execute:	0.18s
Memory:	11.40Mb
CPU:	0.773s

View IL Code