Remote Validation | C# Online Compiler

Remote Validation by Ehsan Sajjad

using System;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;

namespace HelloWorldMvcApp
{
	public class ViewModel
	{
		[Remote("IsEmailAvailable", "Home", HttpMethod = "POST", ErrorMessage = "Email already exists. Please enter a different email address.")]
		public string Email
		{
			get;
			set;
		}
	}
}

Model

​x
 
using System;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;
​
namespace HelloWorldMvcApp
{
    public class ViewModel
    {
        [Remote("IsEmailAvailable", "Home", HttpMethod = "POST", ErrorMessage = "Email already exists. Please enter a different email address.")]
        public string Email
        {
            get;
            set;
        }
    }
}

@model HelloWorldMvcApp.ViewModel
@{
	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>
	
				@using (Html.BeginForm())
				{
					<div class="form-group">
						@Html.LabelFor(m => m.Email)
						@Html.TextBoxFor(model => model.Email, new {@class="form-control"}) 
						@Html.ValidationMessageFor(model => model.Email)
					</div>
				
					<button type="button" class="btn btn-success submit">Check Email</button>
				}
	
				<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>
	</body>
</html>

View

 
@model HelloWorldMvcApp.ViewModel
@{
    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>
    
                @using (Html.BeginForm())
                {
                    <div class="form-group">
                        @Html.LabelFor(m => m.Email)
                        @Html.TextBoxFor(model => model.Email, new {@class="form-control"}) 
                        @Html.ValidationMessageFor(model => model.Email)
                    </div>
                
                    <button type="button" class="btn btn-success submit">Check Email</button>
                }
    
                <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>
    </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 ViewModel());
		}
		
		[HttpPost]
		public ActionResult Index(ViewModel vm)
		{
			if(!ModelState.IsValid)
			return View(vm);
			else
				return View(new ViewModel());
		}

		[HttpPost]
		public JsonResult IsEmailAvailable(string Email)
		{
			// Logic to check whether email is already registered or Not.
			var emailExists = IsEmailRegistered(Email);
			return Json(emailExists, JsonRequestBehavior.AllowGet);
		}

		private bool IsEmailRegistered(string Email)
		{
			return Email == "email@domain.com" ? true : false;
		}
	}
}

Controller

 
using System;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace HelloWorldMvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            return View(new ViewModel());
        }
        
        [HttpPost]
        public ActionResult Index(ViewModel vm)
        {
            if(!ModelState.IsValid)
            return View(vm);
            else
                return View(new ViewModel());
        }
​
        [HttpPost]
        public JsonResult IsEmailAvailable(string Email)
        {
            // Logic to check whether email is already registered or Not.
            var emailExists = IsEmailRegistered(Email);
            return Json(emailExists, JsonRequestBehavior.AllowGet);
        }
​
        private bool IsEmailRegistered(string Email)
        {
            return Email == "email@domain.com" ? true : false;
        }
    }
}

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Using prefix will increment value before expression is evaluated.
Value of x is 6
Value of x is 7

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