How do I return value from callback method

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i use this code to send email in asp.net.this methos is in class.i want to save email info when send completed.how 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);
    try
    {
        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";
    }
}

Posted 11-Nov-15 23:58pm

NewWebDesigner

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Afzaal Ahmad Zeeshan 12-Nov-15 5:05am

void cannot return anything, but you can use it to fill in other fields. So fill in a value in another field and check it later in the code.

NewWebDesigner 12-Nov-15 5:22am

can you explaine more?i dont know how do it?

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Abhinav S · Accepted Answer · 2015-11-12T00:21:00

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Solution 1

One approach to achieve this is to override AsyncCompletedEventArgs and implement your own return methods.
For e.g.

public class CalculatePrimeCompletedEventArgs :
    AsyncCompletedEventArgs
{
public CalculatePrimeCompletedEventArgs(
     ...)
    {
        //Do stuff
    }
}

For the complete example, try How to: Implement a Component That Supports the Event-based Asynchronous Pattern[^].

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Posted 12-Nov-15 0:21am

Abhinav S

Comments

NewWebDesigner 12-Nov-15 5:59am

ok.but it is a complete example.but i am new in web design.can you give me a simple example?

How do I return value from callback method

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How do I return value from callback method

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