Convert Native DLL To Managed DLL

I have an SDK for an IP Camera written in VC++ 6.0. I need to have a wrapper class written in C# that will encompass the functionality from the SDK. We have a web application that we want to incorporate this manufacture's camera. Therefore, we want this wrapper class to be accessed via a web browser to control each camera. Also, the wrapper class will have to be constructed so that multiple instances can be fired against the class as many camera will be accessing the dll frequently.