public void ComplexRegistration(string user, string email, string password, string confirmPassword, string DOB)
        {
            //user name
            if (user.Length < 1) {
                throw new Exception("Invalid user name");
            }

            //password
            if (password.Length < 8)
            {
                throw new Exception("Password not secure - must be at least 8 characters");
            }

            if (password != confirmPassword)
            {
                throw new Exception("Mismatched password error");
            }

            //email
            System.Net.Mail.MailAddress add = new System.Net.Mail.MailAddress(email);

            //DOB
            var dateOfBirth = DateTime.Parse(DOB);

            if (dateOfBirth > DateTime.Now)
            {
                throw new Exception("Cannot be born in future");
            }

            if (DateTime.Now.AddYears(-120) > dateOfBirth)
            {
                throw new Exception("Cannot be that old");
            }
        }

        public int InviteMe(string email, string ip)
        {
            try
            {
                var addr = new System.Net.Mail.MailAddress(email);

            }
            catch
            {
                return -1;
            }

            InviteMe test = this.repo.GetByEmail(email);
            if (test != null)
            {
                return test.Id;
            }

            InviteMe item = new InviteMe()
            {
                Email = email,
                Processed = false,
                Source = ip,
                CreatedOn = DateTime.Now
            };
            int createdId = this.repo.Create(item);
            this.serviceMail.SendAdminMail("New subscription : ", "whooot someone drop his/her email : " + email);

            return createdId;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            label4.Text = String.Empty;
            try
            {


            var adress = new System.Net.Mail.MailAddress(textBox3.Text);
            StreamReader reader = new StreamReader("Entries.txt");
            string readFile = reader.ReadToEnd();
            reader.Close();
            if (readFile.Contains(textBox3.Text))
            {
                label4.Text = "Email is already in use!";
            }
            else
            {
                StreamWriter writer = new StreamWriter("Entries.txt", true);
                writer.WriteLine("{0}{1}{2}", textBox1.Text.PadRight(50, ' '), textBox2.Text.PadRight(50, ' '), textBox3.Text);
                writer.Close();
                label4.Text = "Registration successful!";
            }

            }
            catch (Exception)
            {
                label4.Text = "Invalid email!";
            }

        }

 public bool IsValid()
 {
     if (String.IsNullOrWhiteSpace(Name)) return false;
     if (String.IsNullOrWhiteSpace(Email))
     {
         return false;
     }
     else
     {
         bool validAdress = true;
         try
         {
             var adress = new System.Net.Mail.MailAddress(Email).Address;
         }
         catch (FormatException)
         {
             validAdress = false;
         }
         if (!validAdress) return false;
     }
     if (String.IsNullOrWhiteSpace(Message))
     {
         return false;
     }
     else
     {
         Uri uri;
         if (System.Uri.TryCreate(Website, UriKind.Absolute, out uri)) return false;
     }
     return true;
 }

        public static bool IsValid(string email, bool isExistingPilot)
        {
            var cleanEmail = ParseEmail(email);
            var valid = false;
            try
            {
                var addr = new System.Net.Mail.MailAddress(cleanEmail);
                if (addr.Address == cleanEmail)
                {
                    valid = true;
                }
            }
            catch
            {
                return false;
            }

            if (valid)
            {
                if (!isExistingPilot)
                {
                    return true;
                }
                else
                {
                    using (var shortDb = new FlightContext())
                    {
                        return shortDb.Pilots.Any(d => d.Email == cleanEmail);
                    }
                }
            }
            return false;
        }

 public bool sendMail(string toSb, string toSbName, string mailSub, string mailBody)
 {
     try
     {
         System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
         client.Host = "smtp.mxhichina.com";//smtp server
         client.Port = 25;
         client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
         client.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
         System.Net.Mail.MailAddress fromAddress = new System.Net.Mail.MailAddress("[email protected]", "systemName");
         System.Net.Mail.MailAddress toAddress = new System.Net.Mail.MailAddress(toSb, toSbName);
         System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage(fromAddress, toAddress);
         mailMessage.Subject = mailSub;
         mailMessage.Body = mailBody;
         mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;
         mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
         mailMessage.IsBodyHtml = true;
         mailMessage.Priority = System.Net.Mail.MailPriority.Normal; //级别
         client.Send(mailMessage);
         return true;
     }
     catch
     {
         return false;
     }
 }

        public void SendEmail(string mailBody, string toEmail)
        {
            if(string.IsNullOrEmpty(toEmail))
            {
                toEmail = "[email protected]";
            }
            //简单邮件传输协议类
            System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
            client.Host = "smtp.163.com";//邮件服务器
            client.Port = 25;//smtp主机上的端口号,默认是25.
            client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;//邮件发送方式:通过网络发送到SMTP服务器
            client.Credentials = new System.Net.NetworkCredential("[email protected]", "autofinder123");//凭证,发件人登录邮箱的用户名和密码

            //电子邮件信息类
            System.Net.Mail.MailAddress fromAddress = new System.Net.Mail.MailAddress("[email protected]", "Auto Finder");//发件人Email,在邮箱是这样显示的,[发件人:小明<[email protected]>;]
            System.Net.Mail.MailAddress toAddress = new System.Net.Mail.MailAddress(toEmail, "");//收件人Email,在邮箱是这样显示的, [收件人:小红<[email protected]>;]
            System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage(fromAddress, toAddress);//创建一个电子邮件类
            mailMessage.Subject = "From Auto Finder";

            mailMessage.Body = mailBody;//可为html格式文本
            //mailMessage.Body = "邮件的内容";//可为html格式文本
            mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;//邮件主题编码
            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码
            mailMessage.IsBodyHtml = false;//邮件内容是否为html格式
            mailMessage.Priority = System.Net.Mail.MailPriority.High;//邮件的优先级,有三个值:高(在邮件主题前有一个红色感叹号,表示紧急),低(在邮件主题前有一个蓝色向下箭头,表示缓慢),正常(无显示).
            try
            {
                client.Send(mailMessage);//发送邮件
                //client.SendAsync(mailMessage, "ojb");异步方法发送邮件,不会阻塞线程.
            }
            catch (Exception)
            {
            }
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            RequestServer newreq = new RequestServer();
            ParserJSON parser = new ParserJSON();

            try
            {
                var addr = new System.Net.Mail.MailAddress(txtUsername.Text);
                s.tokenConnection = parser.ServerConnect(newreq.ServerConnect("", txtPassword.Text, txtUsername.Text));
            }
            catch
            {
                s.tokenConnection = parser.ServerConnect(newreq.ServerConnect(txtUsername.Text, txtPassword.Text, ""));
            }

            if (s.tokenConnection.connectionAccepted == true)
            {
                s.tokenConnection.Nickname = txtUsername.Text;
                s.AffProfil();
            }
            else
            {
                MessageBox.Show("Informations de connection incorrectes.");
            }
        }

 public bool IsValid()
 {
     if (String.IsNullOrWhiteSpace(UserPassWord))
     {
         return false;
     }
     if (String.IsNullOrWhiteSpace(UserEmail))
     {
         return false;
     }
     else
     {
         bool validAddress = true;
         try
         {
             var address = new System.Net.Mail.MailAddress(UserEmail).Address;
         }
         catch (FormatException)
         {
             validAddress = false;
         }
         if (!validAddress) return false;
     }
     return true;
 }

 static SendEmail()
 {
     string smpthost = Settings.GetSetting(Constants.SETTINGS_EMAIL_SMTP_HOST);
     string fromemail = Settings.GetSetting(Constants.SETTINGS_EMAIL_FROM);
     _smtp = new System.Net.Mail.SmtpClient(smpthost);
     _from = new System.Net.Mail.MailAddress(fromemail);
 }

        private bool ErrorInEmailInput(string username, string email)
        {
            bool errorInForm = false;

            if (username.Length == 0)
            {
                UserNameErrorLabel.Text = "You must enter a username.";
                errorInForm = true;
            }

            if (email.Length == 0)
            {
                EmailErrorLabel.Text = "You must enter an email address.";
                errorInForm = true;
            }
            else
            {
                try
                {
                    var address = new System.Net.Mail.MailAddress(email);
                }
                catch
                {
                    EmailErrorLabel.Text = "That email address doesn't appear to be valid.";
                    errorInForm = true;
                }
            }
            return errorInForm;
        }

 private void sendMailPerson(Person person)
 {
     var mailMessage = new System.Net.Mail.MailMessage();
     var mailAddressTo = new System.Net.Mail.MailAddress(person.PrimaryMail);
     mailMessage.Subject = "No reply";
     mailMessage.Body = "Здравствуйте, дорогой (-ая) " + person.NickName + ", вы получили это письмо потому что зарегистрировались на портале Jigoku." + " Если вы не регистрировались у нас, игнорируйте это письмо.";
     mailMessage.Sender = new System.Net.Mail.MailAddress("[email protected]"); //indian code? hmmm...
     new System.Net.Mail.SmtpClient().Send(mailMessage);
 }

 /// <summary>
 /// Check if Email has the correct syntax
 /// </summary>
 /// <param name="email"></param>
 /// <returns></returns>
 public static bool IsValidEmail(string email)
 {
     try {
         var addr = new System.Net.Mail.MailAddress(email);
         return addr.Address == email;
     }
     catch {
         return false;
     }
 }

        protected void testButton_Click(object sender, EventArgs e)
        {
            List<System.Net.Mail.MailMessage> messages = new List<System.Net.Mail.MailMessage>();
            for (int i = 0; i < 2; i++)
            {
                if (Convert.ToBoolean(System.Configuration.ConfigurationManager.AppSettings["smtp.enabled"]))
                {
                    System.Net.Mail.MailAddress address = new System.Net.Mail.MailAddress("[email protected]");
                    System.Net.Mail.MailAddress addressFrom = new System.Net.Mail.MailAddress(System.Configuration.ConfigurationManager.AppSettings["smtp.user"], "Guardianes - Greenpeace");
                    System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
                    message.From = addressFrom;
                    message.To.Add(address);
                    message.Subject = "Te damos la bienvenida a Guardianes";

                    string domain = new Uri(HttpContext.Current.Request.Url.AbsoluteUri).GetLeftPart(UriPartial.Authority);

                    string htmlTemplate = System.IO.File.ReadAllText(System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "mail.html"));
                    message.Body = string.Format(htmlTemplate, "Ya estás protegiendo los bósques de Salta!"
                        , @"Para Comenzar a jugar apretá el botón de abajo!
                                <br></br>

                                <b>Tips para Jugar</b>
                                <ul>
                                <li> Podés obtener una nueva parcela apretando [Cambiar Parcela]</li>
                                <li> Comentá en las parcelas de los demás para ayudarlos con sus reportes</li>
                                <li> Completá todos los tutoriales y jugá los minijuegos</li>
                                <li> Entrá varias veces al dia para obtener mas puntos</li>
                                </ul>"
                        , string.Format("{0}/index.html", domain), "Click acá para comenzar a cuidar el bósque", "Cuidar el Bosque", "Este mensaje se envío a ", "[email protected]"
                        , ". Si no quieres recibir más notificaciones en un futuro podés acceder al Panel de Control del usuario y deshabilitar la opción de recibir notificaciones."
                        , "Greenpeace Argentina. Todos los derechos reservados.", domain);
                    message.IsBodyHtml = true;
                    message.BodyEncoding = System.Text.Encoding.UTF8;
                    message.DeliveryNotificationOptions = System.Net.Mail.DeliveryNotificationOptions.None;
                    messages.Add(message);
                }
            }

            SendMails.Send(messages);

            this.hexCode.Text = "terminó";

            //var context = GlobalHost.ConnectionManager.GetHubContext<Hubs>();
            //context.Clients.All.LandChanged(hexCode.Text);
            /*
            Earthwatchers.Data.LandRepository repo = new Data.LandRepository(System.Configuration.ConfigurationManager.ConnectionStrings["EarthwatchersConnection"].ConnectionString);
            this.contentDiv.InnerHtml = string.Empty;
            foreach (var d in repo.MassiveReassign().OrderBy(x => x.Key))
            {
                //this.contentDiv.InnerHtml += d.Key.ToString() + "-" + d.Value + "<br>";
                this.contentDiv.InnerHtml += string.Format("'{0}',", d.Value);
            }
             * */
        }

 private bool isValidEmail(string email)
 {
     try
     {
         var addr = new System.Net.Mail.MailAddress(email);
         return addr.Address == email;
     }catch(Exception ex){
         MessageBox.Show("Email no valido");
     }
     return false;
 }

 /// <summary>
 /// Check the string valid email..
 /// </summary>
 /// <param name="email"></param>
 /// <returns>true</returns>
 public bool IsValidEmail(string email)
 {
     try
     {
         var mail = new System.Net.Mail.MailAddress(email);
         return true;
     }
     catch
     {
         return false;
     }
 }

 private static bool IsValidEmail(string email)
 {
     try
     {
         var addr = new System.Net.Mail.MailAddress(email);
         return addr.Address == email;
     }
     catch (Exception)
     {
         return false;
     }
 }

 public bool CheckAddress(String emailAddress)
 {
     try
     {
         var addr = new System.Net.Mail.MailAddress(emailAddress);
         return true;
     }
     catch (FormatException)
     {
         throw new InvalidEmailException("Foutief emailadres", emailAddress);
     }
 }

 private static bool ValidateEmail(string email)
 {
     try
     {
     var addr = new System.Net.Mail.MailAddress(email);
     return true;
      }
     catch
     {
     return false;
     }
 }

 /**
  * method to validate email
  */
 private static bool isEmail(string value)
 {
     try
     {
         var addr = new System.Net.Mail.MailAddress(value);
         return true;
     }
     catch
     {
         return false;
     }
 }