So, you have been to a couple of business conferences chock full of people you should have no problem conducting business with. At the very least, you should have walked away with a few good contacts who will have no problem giving you some advice or feedback if you run into a business problem or are in need of an introduction. So, why hasn't your network grown and why are you no better off than you were before the conference? Because you are a terrible networker.
Networking is a skill, and you need to work on it in order to improve your game. That includes identifying habits that sabotage your efforts and replacing them with new and more productive habits.
If you have been to several business events, you've probably seen people who fit into the categories below. You may have fallen into some of these traps yourself. Take a few minutes and make your next event worth it -- if not for you, then for everyone else.