You have to reference an interop assembly that can talk to that ActiveXObject...
In Visual Studio, click Add Reference and see if the control you want to use is already listed in either the .NET or COM tabs. If it's not you need to use the AxImp.exe that is part of the .NET SDK to generate the interop assembly.
Once you have the reference added you can new the object the regular C# way.
Good luck!
David Airapetyan / Software Services ArchitectQdabra® Software / Streamline data gathering to turn process into knowledge