The .NET Micro Framework SDK v4.3 (QFE2) contains the base class assemblies, build system extensions and related support for building applications targeting the .NET Micro Framework. In order to debug and deploy applications, to real hardware or the emulator, you will also need the Visual Studio VSIX package for your specific version of Visual Studio. You can obtain the VSIX package from the Visual studio gallery (Search for "netmf") to find the relevant project system support package. You may also need an SDK from the vendor of the hardware platform you are targetting. This might be made available on the gallery or possibly the vendors website, see the documentation that came with your hardware for details.