C++/CLI Using Keyword

#using <XXX::YYY::ZZZ.dll&gt; <= Add a reference to a particular assembly, goes after precompiled header. Make sure to add the path of the referenced assembly to your C# assembly in VS via your assembly's project properties > C/C++ > General > Resolve #using References

using XXX::YYY::ZZZ::StrategyManager; <= Use a specific type (class, enum, ...) from a referenced assembly

using namespace System::Linq; <= Access all types in a namespace from a referenced assembly