I think within over the past 2 days I've had this same conversation with 4 different people. How do you network? How do you build your network?
I have to say that I rarely think about how I'm expanding my network, because I think what I do is build relationships instead. Some people still like to tie it to the word networking, hence the term positive networking.
The way to do it is just find out about the other person's business, what they are involved in, and how you can help them with your services or connect them to other people within your own network. GIVE something first and don't expect that they will or can reciprocate right away. Just know that when they do come across something that relates to your business, they will think of your first. The power of building business relationships instead of just having a network of acquaintances is so, so, SO important in business.
I found all of my advisors, employees and investors through this type of relationship. If you don't genuinely care about the other person's business, why should they care about yours and want to help you?