using System;

using System.ComponentModel.DataAnnotations;

public class Program

{

    public static void Main()

    {

        EmailAddressAttribute attr = new EmailAddressAttribute();

        IsValid("testalias@hotmail.com");

        IsValid("test.alias@hotmail.com");

        IsValid("test.alias@hotmail.co.in");

        IsValid("test_alias@hotmail.co.in");

        IsValid("test_alias@hotmail");

        IsValid("s3_9mik-u-@i.softbank.jp");

        IsValid("s3_9mik-u_@i.softbank.jp");

    }

    private static void IsValid(string emailAddress)

    {

        EmailAddressAttribute attr = new EmailAddressAttribute();

        Console.WriteLine(string.Format("{0} is {1}",  emailAddress, attr.IsValid(emailAddress) ? "valid" : "invalid"));

    }

}