public class GuestResponse
    {
        [Required(ErrorMessage = "Please enter your name")]
        public string Name { get; set; }

        [Required(ErrorMessage = "Please enter your email")]
        [RegularExpression(".+\\@.+\\..+", ErrorMessage = "Invalid email provided. How can we contact you?")]
        public string Email { get; set; }

        [Required(ErrorMessage = "Phone number is also required")]
        public string Phone { get; set; }

        [Required(ErrorMessage = "Please say if you can attend or not")]
        public bool? WillAttent { get; set; }

        private MailMessage BuildMailMessage()
        {
            var message = new StringBuilder();
            message.AppendFormat("Date: {O:yyyy-MM-dd hh:mm}\n", DateTime.Now);
            message.AppendFormat("Response From: {O}\n", Name);
            message.AppendFormat("Contact Email: {O}\n", Email);
            message.AppendFormat("Phone Number: {O}\n", Phone);
            message.AppendFormat("Attending: {O}\n", WillAttent.Value ? "Yes" : "No");
            return new MailMessage("garret2k2@gmail.com", "dejang87@yahoo.com", Name + " Attendance response", message.ToString());
        }

        public void Submit()
        {
            using (var SmtpClient = new SmtpClient())
            using (var MailMessage = BuildMailMessage())
            {
                SmtpClient.Send(MailMessage);
            }

        }

    }