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using System.ComponentModel.DataAnnotations;

namespace HelloWorldMvcApp
{
	public class SampleViewModel
	{
		[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:c}")]
        public float? Costs { get; set; }

	}
}

Model

​x
 
using System.ComponentModel.DataAnnotations;
​
namespace HelloWorldMvcApp
{
    public class SampleViewModel
    {
        [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:c}")]
        public float? Costs { 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</h1> (Please select option2 to fill second dropdown)
	
				@using (Html.BeginForm("Dropdown","Home", FormMethod.Post))
				{
					<select id="EventId" name="eventId">
						<option value="1">option1</option>
						<option value="2">option2</option>
						<option value="3">option3</option>
                    </select>
				
				    <label>Second</label>
				    <select id="SecondDropdown" name="eventId">
  
                    </select>
				    
				
					
				}
				
	
				<br/><br/>
				<div class="alert alert-warning fade">
					<img src="http://entechprod.blob.core.windows.net/dotnetfiddle/morpheus.jpg" style="max-width:100%;"/><br/><br/>
					<strong><span class="alert-content"></span></strong>
				</div>
			</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>
		<script>
			// jquery
			$("#EventId").on("change", function(){
				showValue($(this).val());
			})
			
			function showValue(val)
			{
			    console.log(val);
			
			$.getJSON('@Url.Action("GetDropdownList", "Home")' + "?value=" + val, function (result) {
					
			//$("#SecondDropdown").html(""); // makes select null before filling process
			        var data = result.data;
			        for (var i = 0; i < data.length; i++) {
						$("#SecondDropdown").append("<option>"+ data[i] +"</option>")
			 			console.log(data[i])
					}
			        
				})    
			}
		</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</h1> (Please select option2 to fill second dropdown)
    
                @using (Html.BeginForm("Dropdown","Home", FormMethod.Post))
                {
                    <select id="EventId" name="eventId">
                        <option value="1">option1</option>
                        <option value="2">option2</option>
                        <option value="3">option3</option>
                    </select>
                
                    <label>Second</label>
                    <select id="SecondDropdown" name="eventId">
  
                    </select>
                    
                
                    
                }
                
    
                <br/><br/>
                <div class="alert alert-warning fade">
                    <img src="http://entechprod.blob.core.windows.net/dotnetfiddle/morpheus.jpg" style="max-width:100%;"/><br/><br/>
                    <strong><span class="alert-content"></span></strong>
                </div>
            </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>
        <script>
            // jquery
            $("#EventId").on("change", function(){
                showValue($(this).val());
            })
            
            function showValue(val)
            {
                console.log(val);
            
            $.getJSON('@Url.Action("GetDropdownList", "Home")' + "?value=" + val, function (result) {
                    
            //$("#SecondDropdown").html(""); // makes select null before filling process
                    var data = result.data;
                    for (var i = 0; i < data.length; i++) {
                        $("#SecondDropdown").append("<option>"+ data[i] +"</option>")
                        console.log(data[i])
                    }
                    
                })    
            }
        </script>
    </body>
</html>
​

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

namespace HelloWorldMvcApp
{
	public class HomeController : Controller
	{
		[HttpGet]
		public ActionResult Index()
		{
			
			return View();
		}
		
		[HttpPost]
		public ActionResult Dropdown()
		{
			// add your code after post method is done
			var selectedOption = Request["eventId"];
			return Content(selectedOption);
		}
		
		[HttpGet]
		public JsonResult GetDropdownList(int? value)
		{
			List<string> yourdata = new List<string>();
			
			if(value == 2)
			{
				yourdata.Add("option2a");
			    yourdata.Add("option2b");
			    yourdata.Add("option2c");
				return Json(new { data = yourdata}, JsonRequestBehavior.AllowGet);
			}
			else
			{
				return Json(new { data = ""}, JsonRequestBehavior.AllowGet);
			}
			
			
			
			
		}
	}
}

Controller

 
using System;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace HelloWorldMvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            
            return View();
        }
        
        [HttpPost]
        public ActionResult Dropdown()
        {
            // add your code after post method is done
            var selectedOption = Request["eventId"];
            return Content(selectedOption);
        }
        
        [HttpGet]
        public JsonResult GetDropdownList(int? value)
        {
            List<string> yourdata = new List<string>();
            
            if(value == 2)
            {
                yourdata.Add("option2a");
                yourdata.Add("option2b");
                yourdata.Add("option2c");
                return Json(new { data = yourdata}, JsonRequestBehavior.AllowGet);
            }
            else
            {
                return Json(new { data = ""}, JsonRequestBehavior.AllowGet);
            }
            
            
            
            
        }
    }
}

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