Send Email Asynchronously in C#

In previous section, I introduced how to use event handler to monitor the progress. In this section, I will introduce how to send email asynchronously in C#.

Introduction

In synchronous mode, once SendMail method is called, it returns to application after the method is complete. Therefore, if the runtime (it depends on the networking connection and the email size) is long, your application cannot do anything before this method ends, which results “my application is blocked or halted”. In contrast, in asynchronous mode, as BeginSendMail method works in background, this methods return to application immediately no matter the running method is complete or not.

Note

Remarks: All of samples in this section are based on first section: Send email in a simple C# project. To compile and run the following example codes successfully, please click here to learn how to create the test project and add reference of EASendMail to your project.

[C# - Send Email Asynchronously - Example]

The following example codes demonstrate how to send email asynchronously in C#.

Note

To get the full sample projects, please refer to Samples section.

using System;
using System.Collections.Generic;
using System.Text;
using EASendMail; //add EASendMail namespace
namespace mysendemail
{
    class Program
    {
        static void Main(string[] args)
        {
            SmtpMail oMail = new SmtpMail("TryIt");
            SmtpClient oSmtp = new SmtpClient();

            // Set sender email address, please change it to yours
            oMail.From = "test@emailarchitect.net";

            // Set recipient email address, please change it to yours
            oMail.To = "support@emailarchitect.net";

            // Set email subject
            oMail.Subject = "test email from c# with asynchronous mode";

            // Set email body
            oMail.TextBody = "this is a test email sent from c# project with asynchronous mode";
            // Your smtp server address
            SmtpServer oServer = new SmtpServer("smtp.emailarchitect.net");

            // User and password for ESMTP authentication, if your server doesn't require
            // User authentication, please remove the following codes.
            oServer.User = "test@emailarchitect.net";
            oServer.Password = "testpassword";

            // If your smtp server requires SSL connection, please add this line
            // oServer.ConnectType = SmtpConnectType.ConnectSSLAuto;
            try
            {
                Console.WriteLine("start to send email in asynchronous mode...");
                SmtpClientAsyncResult oResult = oSmtp.BeginSendMail(
                        oServer, oMail, null, null);
                // Wait for the email sending...
                while (!oResult.IsCompleted)
                {
                    Console.WriteLine("waiting..., you can do other thing!");
                    oResult.AsyncWaitHandle.WaitOne(50, false);
                }
                oSmtp.EndSendMail(oResult);
                Console.WriteLine("email was sent successfully!");
            }
            catch (Exception ep)
            {
                Console.WriteLine("failed to send email with the following error:");
                Console.WriteLine(ep.Message);
            }
        }
    }
}

Next Section

At next section I will introduce how to send mass emails with multiple threads in C#.

Appendix

Comments

If you have any comments or questions about above example codes, please click here to add your comments.