cursov (final version, 06.03.2022)

using System;
using System.Net;
using System.IO;
using System.Threading.Tasks;
using System.Net.Mail;


namespace kursovaya
{
    class Program
    {
        class user_data
        {

            // использовать getter-setter для дальнейшего кода
            private protected string my_mail;
            private protected string some_mail;
            private protected string password;
            private protected string nickname;
            private protected string headline;

            public string UserMail
            {
                get { return my_mail;}

                set {
                    if (value == "" | value == " ")
                    {
                        Console.WriteLine("Такое значение недопустимо при заполнении поля 'почта'. Значение сброшено до стандартного ");
                        value = "obechekopm@gmail.com";
                    }
                    else
                    {
                        my_mail = value;
                    }

                }
            }
            public void Print()
            {
                if (some_mail == "")
                {
                    Console.WriteLine($"Письмо от адресанта {my_mail} отправлено адресату {my_mail}");
                }
                else
                {
                    Console.WriteLine($"Письмо от адресанта {my_mail} отправлено адресату {some_mail}");
                }
            }

        }
        class Sendmail : user_data
        {




            public Sendmail(string email_address, string pass)
            {
                my_mail = email_address;
                nickname = "Anonymous";
                password = pass;
                headline = "Testing";

                MailAddress from = new MailAddress(my_mail, nickname);
                MailAddress to = new MailAddress(my_mail);
                MailMessage mess = new MailMessage(from, to);
                mess.Subject = headline;
                mess.Body = "<h2> Письмо-тест </h2>";
                mess.IsBodyHtml = true;
                SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
                smtp.Credentials = new NetworkCredential(my_mail, password);
                smtp.EnableSsl = true;
                smtp.Send(mess);
                Console.Read();

            }

            public Sendmail(
                string mail_1,
                string mail_2,
                string user_pass,
                string for_headline
                )
            {
                my_mail = mail_1;
                nickname = "Anonymous";
                some_mail = mail_2;
                password = user_pass;
                headline = for_headline;

                MailAddress from = new MailAddress(my_mail, nickname);
                MailAddress to = new MailAddress(some_mail);
                MailMessage mess = new MailMessage(from, to);
                mess.Subject = headline;
                mess.Body = "<h2> Письмо-тест </h2>";
                mess.IsBodyHtml = true;
                SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
                smtp.Credentials = new NetworkCredential(my_mail, password);
                smtp.EnableSsl = true;
                smtp.Send(mess);
                Console.Read();

            }

            public Sendmail(
                string username,
                string mail_1,
                string mail_2,
                string user_pass,
                string for_headline
                )
            {
                my_mail = mail_1;
                nickname = username;
                some_mail = mail_2;
                password = user_pass;
                headline = for_headline;

                MailAddress from = new MailAddress(my_mail, nickname);
                MailAddress to = new MailAddress(some_mail);
                MailMessage mess = new MailMessage(from, to);
                mess.Subject = headline;
                mess.Body = "<h2> Письмо-тест </h2>";
                mess.IsBodyHtml = true;
                SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
                smtp.Credentials = new NetworkCredential(my_mail, password);
                smtp.EnableSsl = true;
                smtp.Send(mess);
                Console.Read();

            }

            static void Main(string[] args)
            {
                string user_email = Console.ReadLine();
                string pas = Console.ReadLine();
                Sendmail some_mail = new Sendmail(user_email, pas);
                some_mail.Print();
            }


        }

    }
}