Sending an email by reading a ContactDetail

public void NotifyByEmail (String messageToSend, ulong ContactID)
    {
        //1. read ContactEmail and Name through ContactID, temporarily hard coded.
        String emailAddress = "ben@contoso.com";
        ContactDetailEmail ce = new ContactDetailEmail("ben@contoso.com");

        //2. prepare email
        String senderFirstName = "Jon";
        String senderSecondName = "C.";
        SmtpClient client = new SmtpClient();
        MailAddress from = new MailAddress(emailAddress, 
               senderFirstName + (char)0xD8 + senderSecondName, System.Text.Encoding.UTF8);
        /* See http://en.wikipedia.org/wiki/UTF-8  */
        MailAddress to = new MailAddress("ben@contoso.com");
        MailMessage message = new MailMessage(from, to);
        message.Body = "This is a test e-mail message sent by an application. ";
        // Include some non-ASCII characters in body and subject. 
        string someArrows = new string(new char[] { '\u2190', '\u2191', '\u2192', '\u2193' });
        message.Body += Environment.NewLine + someArrows;
        message.BodyEncoding = System.Text.Encoding.UTF8;
        message.Subject = "test message 1" + someArrows;
        message.SubjectEncoding = System.Text.Encoding.UTF8;
        // Set the method that is called back when the send operation ends.
        string userState = "test message1";
        client.SendAsync(message, userState);

        #if DEBUG
        Console.WriteLine("DEBUG: Sending message");
        #endif
        /* Code snippet sourced from http://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient(v=vs.110).aspx */

    
    }

ContactDetail.cs
public static List<ContactDetailEmail> ContactDetailEmail = new List<ContactDetailEmail>();
    public String getContactDetailEmail(Int32 ContactID)
    {
        //what goes here?
        return null;
    }