[Resolved] Blocking an IP address

Is there a way to block incoming connections from a specific IP address on a specific port, through VB programming?

for example, block all incoming connections/traffic from 200.2.2.2 on port 1234 (TCP protocol).

The language is VB .NET 2005.

Thanks

EDIT: resolved

If you have resolved this, please post your solution as it might help others.