Hi,
The Tobii Gaze SDK has the corresponding level of dll:s. A native Tobii.GazeCore32.dll and a managed Tobii.Gaze.Core.Net.dll. The .Net samples are written in C#.
Our general recommendation is to use the EyeX SDK because the EyeX Engine runtime takes care of all the setup of the eye tracker, screen setup and user calibration, and also gives you the eye-gaze data in pixel coordinates which automatically adapts if the user changes DPI settings or adds or removes secondary display monitors to the computer, and so on. You can read about the difference between the SDK’s here: http://developer.tobii.com/differences-between-tobii-gaze-sdk-and-tobii-eyex-sdk/