Hi @ro1000, it still sounds like a path issue in that the files have not been properly linked
to the visual studio project. However, in terms of other sources of getting started coding
with the EyeX/C4 there is separate documentation and tutorials setup for the Tobii Core SDK which
includes extra samples and some more detailed information on getting up and running.
You can download the various samples @ https://github.com/Tobii/CoreSDK
With associated documentation available @ https://tobii.github.io/CoreSDK/articles/intro.html
I would suggest you first run one of the sample projects included and from there try to build up a project from scratch.
Also, I would advise using Visual Studio 2015 to make NuGet packages easier to install.
Please let me know how you get on.