C# Online Compiler | .NET Fiddle

<no name> by Anonymous

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

namespace HelloWorldMvcApp
{
	public class Address
	{
		public Byte id
		{
			get;
			set;
		}

		public int addrCC
		{
			get;
			set;
		}

		public string cName
		{
			get;
			set;
		}
	}

	public class lsAddress : List<Address>
	{
	}

	public class reqView
	{
		public int dix
		{
			get;
			set;
		}

		public string Name
		{
			get;
			set;
		}

		/* Loads of properties */
		private lsAddress _addresses = new lsAddress
		{
		new Address
		{
		id = 1
		}

		, new Address
		{
		id = 2
		}
		}

		;
		public lsAddress lsAddress
		{
			get
			{
				return _addresses;
			}

			set
			{
				_addresses = value;
			}
		}
	}

	public class A
	{
		public int id
		{
			get;
			set;
		}

		public string text
		{
			get;
			set;
		}

		public int[] dix = new int[]
		{
		1, 2
		}

		;
	}

	public class tyDIX
	{
		private int _id = 1;
		public int id
		{
			get
			{
				return _id;
			}

			set
			{
				_id = value;
			}
		}

		public string text
		{
			get;
			set;
		}
	}

	public static class CacheConfig
	{
		public static IEnumerable<A> Countries = Enumerable.Range(1, 5).Select(c => new A()
		{
		id = c, text = "Country_" + (c + 1)}

		);
		public static IEnumerable<tyDIX> dix = Enumerable.Range(0, 3).Select(c => new tyDIX
		{
		id = c, text = c.ToString()}

		);
	}
}

Model

​x
 
using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
​
namespace HelloWorldMvcApp
{
    public class Address
    {
        public Byte id
        {
            get;
            set;
        }
​
        public int addrCC
        {
            get;
            set;
        }
​
        public string cName
        {
            get;
            set;
        }
    }
​
    public class lsAddress : List<Address>
    {
    }
​
    public class reqView
    {
        public int dix
        {
            get;
            set;
        }
​
        public string Name
        {
            get;
            set;
        }
​
        /* Loads of properties */
        private lsAddress _addresses = new lsAddress
        {
        new Address
        {
        id = 1
        }
​
        , new Address
        {
        id = 2
        }
        }
​
        ;
        public lsAddress lsAddress
        {
            get
            {
                return _addresses;
            }
​
            set
            {
                _addresses = value;
            }
        }
    }
​
    public class A
    {
        public int id
        {
            get;
            set;
        }
​
        public string text
        {
            get;
            set;
        }
​
        public int[] dix = new int[]
        {
        1, 2
        }
​
        ;
    }
​
    public class tyDIX
    {
        private int _id = 1;
        public int id
        {
            get
            {
                return _id;
            }
​
            set
            {
                _id = value;
            }
        }
​
        public string text
        {
            get;
            set;
        }
    }
​
    public static class CacheConfig
    {
        public static IEnumerable<A> Countries = Enumerable.Range(1, 5).Select(c => new A()
        {
        id = c, text = "Country_" + (c + 1)}
​
        );
        public static IEnumerable<tyDIX> dix = Enumerable.Range(0, 3).Select(c => new tyDIX
        {
        id = c, text = c.ToString()}
​
        );
    }
}

@model HelloWorldMvcApp.reqView
@{
	Layout = null;
}

<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->

<html lang="en">
	<head>
		<meta charset="utf-8">
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>Bootstrap 101 Template</title>

		<!-- CSS Includes -->
		<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
		
		<style type="text/css">

			.field-validation-error {
				color: #ff0000;
			}

		</style>
	</head>
	
	<body>
			@using (Html.BeginForm()) {
		<div class="container">
			<div class="col-md-12">
                <div class="form-group">
                    <h4>dix</h4>
                    @Html.DropDownListFor(model => model.dix,
										  new SelectList(HelloWorldMvcApp.CacheConfig.dix, "id", "text", Model.dix),
                        new { @class = "form-control", onchange = "this.form.submit();" })
                </div>
			
                @{var cur = -1;}
                @switch (Model.dix)
                {
                    case 0:
                        @Html.DropDownListFor(model => model.lsAddress[0].addrCC,
                                new SelectList(HelloWorldMvcApp.CacheConfig.Countries.Where(c => c.dix.Contains(Model.dix)), "id", "text", Model.lsAddress[0].addrCC),
                                new { @class = "form-control", disabled = "disabled" } as object)
                        break;
                    case 1:
                    @Html.DropDownListFor(model => model.lsAddress[0].addrCC,
                                new SelectList(HelloWorldMvcApp.CacheConfig.Countries.Where(c => c.dix.Contains(Model.dix)), "id", "text", Model.lsAddress[0].addrCC),
                                new { @class = "form-control" } as object);
                    cur = 0;                    
                    break;
                    case 2:
                    @Html.DropDownListFor(model => model.lsAddress[1].addrCC,
                                new SelectList(HelloWorldMvcApp.CacheConfig.Countries.Where(c => c.dix.Contains(Model.dix)), "id", "text", Model.lsAddress[1].addrCC),
                                new { @class = "form-control" } as object);
                    cur = 1;
                        break;
                }
                @for (int i = 0; i < Model.lsAddress.Count; i++)
                {
                if (i == cur) { continue; }
                @Html.HiddenFor(model => model.lsAddress[i].addrCC)
                }
			</div>
		</div>
}
		
	</body>
</html>

View

 
@model HelloWorldMvcApp.reqView
@{
    Layout = null;
}
​
<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->
​
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Bootstrap 101 Template</title>
​
        <!-- CSS Includes -->
        <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
        
        <style type="text/css">
​
            .field-validation-error {
                color: #ff0000;
            }
​
        </style>
    </head>
    
    <body>
            @using (Html.BeginForm()) {
        <div class="container">
            <div class="col-md-12">
                <div class="form-group">
                    <h4>dix</h4>
                    @Html.DropDownListFor(model => model.dix,
                                          new SelectList(HelloWorldMvcApp.CacheConfig.dix, "id", "text", Model.dix),
                        new { @class = "form-control", onchange = "this.form.submit();" })
                </div>
            
                @{var cur = -1;}
                @switch (Model.dix)
                {
                    case 0:
                        @Html.DropDownListFor(model => model.lsAddress[0].addrCC,
                                new SelectList(HelloWorldMvcApp.CacheConfig.Countries.Where(c => c.dix.Contains(Model.dix)), "id", "text", Model.lsAddress[0].addrCC),
                                new { @class = "form-control", disabled = "disabled" } as object)
                        break;
                    case 1:
                    @Html.DropDownListFor(model => model.lsAddress[0].addrCC,
                                new SelectList(HelloWorldMvcApp.CacheConfig.Countries.Where(c => c.dix.Contains(Model.dix)), "id", "text", Model.lsAddress[0].addrCC),
                                new { @class = "form-control" } as object);
                    cur = 0;                    
                    break;
                    case 2:
                    @Html.DropDownListFor(model => model.lsAddress[1].addrCC,
                                new SelectList(HelloWorldMvcApp.CacheConfig.Countries.Where(c => c.dix.Contains(Model.dix)), "id", "text", Model.lsAddress[1].addrCC),
                                new { @class = "form-control" } as object);
                    cur = 1;
                        break;
                }
                @for (int i = 0; i < Model.lsAddress.Count; i++)
                {
                if (i == cur) { continue; }
                @Html.HiddenFor(model => model.lsAddress[i].addrCC)
                }
            </div>
        </div>
}
        
    </body>
</html>
​

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

namespace HelloWorldMvcApp
{
	public class HomeController : Controller
	{
		[HttpGet]
		public ActionResult Index()
		{
			var model = (reqView)TempData["reqView"];
			if (model == null)
				model = new reqView();
			TempData["reqView"] = model;
			return View(model);
		}

		[HttpPost]
		public ActionResult Index(reqView model)
		{
			TempData["reqView"] = model;
			
			//return RedirectToAction("Index", "Home");
			return View(model);
		}
	}
}

Controller

 
using System;
using System.Linq;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace HelloWorldMvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            var model = (reqView)TempData["reqView"];
            if (model == null)
                model = new reqView();
            TempData["reqView"] = model;
            return View(model);
        }
​
        [HttpPost]
        public ActionResult Index(reqView model)
        {
            TempData["reqView"] = model;
            
            //return RedirectToAction("Index", "Home");
            return View(model);
        }
    }
}

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