Difference between smtpClient.send() and smtpClient.SendAsync()?

I am t开发者_如何学编程rying to send mail from localhost..

and on doing this i have got methods from different sites to sending mails..but on doing this i am confused between smtpClient.send() and smtpClient.SendAsync()..

I want to know that How they are different from each other???

Thanks in advance..

smtpClient.send() will initiate the sending on the main/ui thread and would block.
smtpClient.SendAsync() will pick a thread from the .NET Thread Pool and execute the method on that thread. So your main UI will not hang or block.

Async Method Invocation - http://www.codeproject.com/KB/cs/AsyncMethodInvocation.aspx

SendAsyc - Sends the specified e-mail message to an SMTP server for delivery. This method does not block the calling thread and allows the caller to pass an object to the method that is invoked when the operation completes. More details : SmtpClient.SendAsync Method