Networks are defined by thier IP address. 10.x.x.x and 11.x.x.x are two different networks. I guess you could give the 2 clients a SMN of 255.255.0.0, but it that would simply make them part of the same network. If you're going to do that, you would be better off giving them both IP addresses in the same range, but, depending on your situation, this may not be an option. BTW, by giving them IP addresses in the same range, I mean one gets 192.168.1.1 and the other gets 192.168.1.2.
Pansophic is right. You need either a router or a proxy server to connect your networks. However, since you want to cennect a "share", I'm going to assume you're using Windows as your file server. Windows based file sharing requires NETBIOS, and that means you'll need to enable this on your router/proxy server, or else you may probably won't see the Windows share.