Networking is more than simply about being in broadcast mode and handing out business cards. To be successful and to make yourself memorable it's essential to show a real interest in others and an openness to learning about them. They are then far more likely to be interested in you in return.
You should also do your homework before attending any event - who do you want to meet, what do you want to get from it and how are you going to go about it?
With some simple preparation, it's even possible to make networking something to be enjoyed rather than endured!
How successful you will be in improving personal impact and developing networking skills comes down to two things: your perspective; and how willing you are to work at it.