You can find nice winforms samples here:
You can also check wpf samples:
It’s also important to say that storing the data in a database for future use is forbidden by the SDK license agreement.
3.4.1 Not for analytical use. Unless Licensee enters into a separate
agreement with Tobii, the SDK may not be used to develop and
distribute software for analytical purposes, post processing or
aggregation of eye tracking data across multiple users.
Specifically, this means that such software may not (i) transfer
data about eye movements, behavior, intention or attention
generated by or derived from the Software Components to
another computing device, network, display or printer; or (ii)
store data about eye movements, behavior, intention or
attention generated by or derived from the Software
Components on any persistent storage media (except for
calibration files and data used for accuracy-enhancing filters),
i.e. data may only be stored in primary memory and only while
it is being processed.