Asynchronously sending Emails in C#?

Question

I\'m developing an application where a user clicks/presses enter on a certain button in a window, the application does some checks and determines whether to send out a coupl

Answer 1

Here is a fire and forget approach together with async using .Net 4.5.2+:

BackgroundTaskRunner.FireAndForgetTaskAsync(async () =>
{
    SmtpClient smtpClient = new SmtpClient(); // using configuration file settings
    MailMessage message = new MailMessage(); // TODO: Initialize appropriately
    await smtpClient.SendMailAsync(message);
});

where BackgroundTaskRunner is:

public static class BackgroundTaskRunner
{     
    public static void FireAndForgetTask(Action action)
    {
        HostingEnvironment.QueueBackgroundWorkItem(cancellationToken => // .Net 4.5.2+ required
        {
            try
            {
                action();
            }
            catch (Exception e)
            {
                // TODO: handle exception
            }
        });
    }

    /// 

    /// Using async
    /// 
    public static void FireAndForgetTaskAsync(Func action)
    {
        HostingEnvironment.QueueBackgroundWorkItem(async cancellationToken => // .Net 4.5.2+ required
        {
            try
            {
                await action();
            }
            catch (Exception e)
            {
                // TODO: handle exception
            }
        });
    }
}

Works like a charm on Azure App Services.