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How do I return value from callback method

NewWebDesigner asked:

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i use this code to send email in methos is in class.i want to save email info when send can return a value from this method to page that if send return true,if error occured return false.then code in page save email info?
thank you in advance.

public void SendAsyncMail()
    MailMessage mail = new MailMessage();

    mail.From = new MailAddress("Enter from mail address");
    mail.To.Add(new MailAddress("Enter to address #1"));
    mail.To.Add(new MailAddress("Enter to address #2"));
    mail.Subject = "Enter mail subject";
    mail.Body = "Enter mail body";

    SmtpClient smtpClient = new SmtpClient();
    Object state = mail;

    //event handler for asynchronous call
    smtpClient.SendCompleted += new SendCompletedEventHandler(smtpClient_SendCompleted);
        smtpClient.SendAsync(mail, state);
    catch (Exception ex) { /* exception handling code here */ }

void smtpClient_SendCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
    MailMessage mail = e.UserState as MailMessage;

    if (!e.Cancelled && e.Error!=null)
        message.Text = "Mail sent successfully";


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