Authorize.Net SIM Method With Response using C#

I have been trying to implement the Authorize.NEt SIM Method using the information given on their website and tutorials.But i have been only able to redirect to their payment gateway using the ddl provided b开发者_运维技巧y them.I need a way to get a response from SIM Method to know about the transaction status.

Either use relay response or silent post (I am the author of that blog post).