C#实现异步发送邮件的方法

MailMessage m = new MailMessage  ("item@VeVB.COm",  "raja@VeVB.COm",  "This is the subject for the authorized email.",  "This is the body of the authorized mail!...");// Send the message using authorizationSmtpClient client = new SmtpClient("smtp.VeVB.COm");client.Credentials = new NetworkCredential("user", "password");client.EnableSsl = true;// Add the event handlerclient.SendCompleted += new SendCompletedEventHandler(mail_SendCompleted);// Send the message asynchronouslyclient.SendAsync(m, null);// To Cancel the send//client.SendAsyncCancel();void mail_SendCompleted(object sender, AsyncCompletedEventArgs e){  if (e.Cancelled)    Console.WriteLine("Message cancelled");  else if (e.Error != null)    Console.WriteLine("Error: " + e.Error.ToString());  else    Console.WriteLine("Message sent");}