C# Online Compiler | .NET Fiddle

<no name> by Anonymous

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


namespace HelloWorldMvcApp
{
	public class SampleViewModel
	{
		public List<DropDownCategoryModel> DropDownCategoryModels { get; set; }
		public int SelectedCategoryId{ get;set;}
		public int SelectedSubCategoryId {get;set;}
	}
	
	public class DropDownCategoryModel
	{
		public string Name {get; set;}
		
		public int Id  {get; set;}
	}
}

Model

​x
 
using System;
using System.ComponentModel.DataAnnotations;
using System.Collections.Generic;
using System.Linq;
​
​
namespace HelloWorldMvcApp
{
    public class SampleViewModel
    {
        public List<DropDownCategoryModel> DropDownCategoryModels { get; set; }
        public int SelectedCategoryId{ get;set;}
        public int SelectedSubCategoryId {get;set;}
    }
    
    public class DropDownCategoryModel
    {
        public string Name {get; set;}
        
        public int Id  {get; set;}
    }
}

@model HelloWorldMvcApp.SampleViewModel
@{
	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>
		<div class="container">
			<div class="col-md-6 col-md-offset-3">
				<h1>Hello Stranger</h1>
					
			</div>
		</div>

		<!-- JS includes -->
		<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
		<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
	
		<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
		<script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
		

	</body>
</html>

View

 
@model HelloWorldMvcApp.SampleViewModel
@{
    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>
        <div class="container">
            <div class="col-md-6 col-md-offset-3">
                <h1>Hello Stranger</h1>
                    
            </div>
        </div>
​
        <!-- JS includes -->
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
        <script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
    
        <script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
        <script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
        
​
    </body>
</html>
​

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

namespace HelloWorldMvcApp
{
	public class HomeController : Controller
	{
		[HttpGet]
		public ActionResult Index()
		{
			var model = new SampleViewModel();
			model.DropDownCategoryModels = new List<DropDownCategoryModel>{
				new DropDownCategoryModel{
					Name = "Products",
					Id = 1
				},
			    new DropDownCategoryModel{
					Name = "Services",
					Id = 2
				}
				
			};					
		    						
			return View(model);
		}


		[HttpPost]
		public JsonResult GetNextCategoryDropDownValues(int categoryId)
		{				
			var subCategories = new List<SelectListItem>();
			string prefix = string.Empty;
			switch(categoryId)
			{
				case 1:
					prefix = "Product";
					break;
				case 2:
					prefix = "Service";
					break;
					
			};
			
			for(var i = 1; i<5; i++)
			{
				subCategories.Add(new SelectListItem{
					Text = prefix + i.ToString(),
					Value =  i.ToString()
				});
			}
			return Json(subCategories);
		}
	}
}

Controller

 
using System;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace HelloWorldMvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            var model = new SampleViewModel();
            model.DropDownCategoryModels = new List<DropDownCategoryModel>{
                new DropDownCategoryModel{
                    Name = "Products",
                    Id = 1
                },
                new DropDownCategoryModel{
                    Name = "Services",
                    Id = 2
                }
                
            };                  
                                    
            return View(model);
        }
​
​
        [HttpPost]
        public JsonResult GetNextCategoryDropDownValues(int categoryId)
        {               
            var subCategories = new List<SelectListItem>();
            string prefix = string.Empty;
            switch(categoryId)
            {
                case 1:
                    prefix = "Product";
                    break;
                case 2:
                    prefix = "Service";
                    break;
                    
            };
            
            for(var i = 1; i<5; i++)
            {
                subCategories.Add(new SelectListItem{
                    Text = prefix + i.ToString(),
                    Value =  i.ToString()
                });
            }
            return Json(subCategories);
        }
    }
}

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