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Send Email Over SMTP Aschronously

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To send email over SMTP asynchronously, create a SmtpClient, call its SendAsync method, and add a SendCompleted event handler to your code:

//Call the SmtpClient SendAsync method SmtpClient client = new SmtpClient(_smtpServer);client.SendCompleted += new    SendCompletedEventHandler(client_SendCompleted);client.SendAsync(message, "Sending..");

When the SendAsync method completes, it will fire the SendCompleted event, where you can check for errors:

private static void client_SendCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e){   String token = (string)e.UserState;   if (e.Error != null)   {      throw e.Error;   }   else   {       //   }}

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