using System;

using System.ComponentModel.DataAnnotations;

​

public class Program

{

    public static void Main()

    {

        var foo = new EmailAddressAttribute();

        bool bar;

        bar = foo.IsValid("someone@somewhere.com");         //true

        Console.WriteLine(bar);

​

        bar = foo.IsValid("someone@somewhere.co.uk");       //true

                Console.WriteLine(bar);

​

        bar = foo.IsValid("someone+tag@somewhere.net");     //true

                Console.WriteLine(bar);

​

        bar = foo.IsValid("futureTLD@somewhere.fooo");      //true

                Console.WriteLine(bar);

​

​

        bar = foo.IsValid("fdsa");                          //false

                Console.WriteLine(bar);

​

        bar = foo.IsValid("fdsa@");                         //false

                Console.WriteLine(bar);

​

        bar = foo.IsValid("fdsa@fdsa");                     //false

                Console.WriteLine(bar);

​

        bar = foo.IsValid("fdsa@fdsa.");                    //false

                Console.WriteLine(bar);

​

​

        //one-liner

        if (new EmailAddressAttribute().IsValid("someone@somewhere.com"))

            bar = true;         }

}