using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

    }

​

}

​

public class Employee   

    {   

        public async Task EmployeeRegistration(Employee employee)   

        {   

            StaticData.Employees.Add(employee);   

            await SendEmailAsync(employee.Email, "Registration", "Congratulation ! Your are successfully registered.");   

        }   

​

        private async Task SendEmailAsync(string email, string subject, string message)   

        {   

            try{ 

​

                var emailMessage = new MimeMessage();   

                emailMessage.From.Add(new MailboxAddress("Mark Adam", "madam@sample.com"));   

                emailMessage.To.Add(new MailboxAddress(string.Empty, email));   

                emailMessage.Subject = subject;   

                emailMessage.Body = new TextPart("plain") { Text = message };   

​

                using (SmtpClient smtpClient = new SmtpClient())   

                {   

                    smtpClient.LocalDomain = "sample.com";   

                    await smtpClient.ConnectAsync("smtp.relay.uri", 25, SecureSocketOptions.None).ConfigureAwait(false);   

                    await smtpClient.SendAsync(emailMessage).ConfigureAwait(false);   

                    await smtpClient.DisconnectAsync(true).ConfigureAwait(false);   

                }   

            } 

            catch(Exception ex) 

            { 

            } 

        }   

}