please tel me how to use my classes declarations and definetions in c++ with vb.net

You can achieve that in various ways
1- Managed C++ within your solution.(in case you've some developers need to write their code in managed C++)
2- Add reference to library aka .dll (developed with managed C++)

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.