It is possible to calibrate with C#, but we do not have any sample yet.
If you know your WPF you should be able to build your own calibration User Control using these methods on your IEyeTracker instance.
IEyeTracker.StartCalibrationAsync
IEyeTracker.AddCalibrationPointAsync (for each point you display on screen)
IEyeTracker.ComputeAndSetCalibrationAsync
IEyeTracker.StopCalibrationAsync (on error or cancel)