I'm B.sc computer science student.I am searching a project in vb.net.I want to make cybar cafe management system but not so clear about this system.Can anyone help me?

If you start with proper analysis of existing Cyber Cafe Software like that from TinaSoft (http://www.tinasoft.com/easycafe/) then you probably have a general idea about the modules that you need to program. Offering help on specific modules is easier. Also finding Public Free Available Code for these modules will be easier than finding a whole project for a niche.