How to prevent SMS going to inbox

I'm developing a business SMS application. In this app, if an incoming message is from a particular number, say 999999999, it should go to the application's inbox and not to the default native inbox. All other messages should go to the phone's native inbox. How do I do this?

I have googled : http://stackoverflow.com/questions/9175969/how-to-prevent-sms-going-to-inbox-in-android

abortBroadcast();

and this method isnt in C# .