Attach file to aegis implicit SMTP server using C#

Hi,

I am using aegis implicit smtp server to send mail.I want to attach excel creted using closedxml and saved in memorystream.Below is the code using to send mail

 var mailMessage = new MimeMailMessage();
        mailMessage.From = new MimeMailAddress(mailAddress);
        mailMessage.To.Add(userTo);
        mailMessage.Subject = subject;
        mailMessage.Body = message;

        //Create Smtp Client
        var mailer = new MimeMailer(host, 465);
        mailer.User = userName;
        mailer.Password = password;
        mailer.SslType = SslMode.Ssl;
        mailer.AuthenticationMode = AuthenticationType.Base64;

        //Set a delegate function for call back
        mailer.SendCompleted += compEvent;
        mailer.SendMailAsync(mailMessage);