C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.ComponentModel.DataAnnotations;

namespace HelloWorldMvcApp
{
	
}

Model

​x
 
using System;
using System.ComponentModel.DataAnnotations;
​
namespace HelloWorldMvcApp
{
    
}

@{
	Layout = null;
}

<!DOCTYPE html>
<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>Post sample</h1>
				<form action="/Home/GetAnswer" method="post" id="filter_frm" autocomplete="off" enctype="multipart/form-data">
					<div class="form-group">
						<select id="filter"
						  		name="filter" 
								multiple="multiple"
								class="form-control js-data-example-ajax col-sm-12">
    						<option selected="selected">Multiple</option>
    						<option>Multiple2</option>
    						<option selected="selected">Multiple3</option>
  						</select>
						<button type="submit" class="btn btn-success submit">Ok</button>
					</form>
					
					<div class="alert alert-sucess">
						<span class="label label-info">Tu selección:</span>: <span id="result"></span>
					</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 type="text/javascript">
		
			$("#filter_frm").submit(function (e) {
				e.preventDefault();
				var data = $(this).serialize();
				$.ajax({
					url: "@Url.Action("Received", "Home")",
					type: "post",
					data: data,
					traditional: true,
					success: function (response) {
						var items = response.join(", ");
						$("#result").text(items);
					}
				});
			});
		</script>
	</body>
</html>

View

 
@{
    Layout = null;
}
​
<!DOCTYPE html>
<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>Post sample</h1>
                <form action="/Home/GetAnswer" method="post" id="filter_frm" autocomplete="off" enctype="multipart/form-data">
                    <div class="form-group">
                        <select id="filter"
                                name="filter" 
                                multiple="multiple"
                                class="form-control js-data-example-ajax col-sm-12">
                            <option selected="selected">Multiple</option>
                            <option>Multiple2</option>
                            <option selected="selected">Multiple3</option>
                        </select>
                        <button type="submit" class="btn btn-success submit">Ok</button>
                    </form>
                    
                    <div class="alert alert-sucess">
                        <span class="label label-info">Tu selección:</span>: <span id="result"></span>
                    </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 type="text/javascript">
        
            $("#filter_frm").submit(function (e) {
                e.preventDefault();
                var data = $(this).serialize();
                $.ajax({
                    url: "@Url.Action("Received", "Home")",
                    type: "post",
                    data: data,
                    traditional: true,
                    success: function (response) {
                        var items = response.join(", ");
                        $("#result").text(items);
                    }
                });
            });
        </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 JsonResult Received(string[] filter)
		{	
			return Json(filter);
		}
	}
}

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 JsonResult Received(string[] filter)
        {   
            return Json(filter);
        }
    }
}

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