how to send email with attachments?

mail.From = new MailAddress(Main.ml.Text);
            mail.Subject = subject.Text;
            mail.Body = message.Text;
            
            foreach (string s in to.Text.Split(';'))
            {
                mail.To.Add(s);
            }
foreach (Attachment attach in attachment.Text.Split(';'))
{
mail.Attachments.Add(attach)
}
            {
                mail.To.Add(s);
            }

            
            mail.Headers.Add("Disposition-Notification-To", Main.ml.Text);
            mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;

            SmtpClient client = new SmtpClient(Main.smtp.Text);
            client.Port = 25;
            client.Credentials = new System.Net.NetworkCredential(emailusername.Text, emailpassword.Text);
            
                client.EnableSsl = true;
            
            client.Send(mail);