The native BMap library should be placed together with managed `BMapSharp` dynamic library.
The native BMap library must be named as `BMap.dll` (in Windows), `BMap.so` (in Linux or BSD), `BMap.dylib` (in macOS), or `BMap.bin` (in any other platforms).
If you are building final distributed package file (I have not build them yet), you may need manually put native BMap library file into package file because I have not write this behavior in any place.