C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.ComponentModel.DataAnnotations;

namespace HelloWorldMvcApp
{
	public class SampleViewModel
	{
		[Required, Range(0,145)]
		
		public int? Criterion  { get; set; }
	}
}

Model

​x
 
using System;
using System.ComponentModel.DataAnnotations;
​
namespace HelloWorldMvcApp
{
    public class SampleViewModel
    {
        [Required, Range(0,145)]
        
        public int? Criterion  { get; set; }
    }
}

@model HelloWorldMvcApp.SampleViewModel

<!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">
	</head>
	
	<body>
		<div class="container">
			<div class="col-md-6 col-md-offset-3">
				@using (Html.BeginForm())
				{
					<div class="form-group">
						@Html.LabelFor(m => m.Criterion)
						@Html.TextBoxFor(model => model.Criterion, new {@class="form-control"}) 
						@Html.ValidationMessageFor(model => model.Criterion)
					</div>
					<button type="submit" class="btn btn-success submit">Test</button>
				}
			</div>
		</div>
	</body>
</html>

View

 
@model HelloWorldMvcApp.SampleViewModel
​
<!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">
    </head>
    
    <body>
        <div class="container">
            <div class="col-md-6 col-md-offset-3">
                @using (Html.BeginForm())
                {
                    <div class="form-group">
                        @Html.LabelFor(m => m.Criterion)
                        @Html.TextBoxFor(model => model.Criterion, new {@class="form-control"}) 
                        @Html.ValidationMessageFor(model => model.Criterion)
                    </div>
                    <button type="submit" class="btn btn-success submit">Test</button>
                }
            </div>
        </div>
    </body>
</html>
​

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

namespace HelloWorldMvcApp
{
	public class HomeController : Controller
	{
		[HttpGet]
		public ActionResult Index()
		{
			return View(new SampleViewModel());
		}


		[HttpPost]
		public ActionResult Index(SampleViewModel model)
		{				
			if(ModelState.IsValid)
			{
				return Content("Success!");
			}
			return View(model);
		}
	}
}

Controller

 
using System;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace HelloWorldMvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            return View(new SampleViewModel());
        }
​
​
        [HttpPost]
        public ActionResult Index(SampleViewModel model)
        {               
            if(ModelState.IsValid)
            {
                return Content("Success!");
            }
            return View(model);
        }
    }
}

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