Sending Bulk email without timeout in asp.net

Question

Hi all,
In my website i want to dispatch email to around 1lakhs emails. How it can be done without timeout.
In php we have class.phpmailer.php, i want something similar to this.

Once the user click on the send button for the dispatch, it has to dispatch to the whole email list even the browser is closed.
Any help is appriciated.

Thanks,
Saji.