Hi @abdelrahamn2020, and thanks for your query. It would appear you are using the Tobii Pro (Research) SDK which is not supported with the Tobii Eye Tracker 5.
If you wish to capture data from this tracker, then we recommend you use the Tobii Interaction Library which has the c# bindings you require.
We provide a full tutorial for using this SDK online @ https://developer.tobii.com/consumer-eye-trackers-interaction-library-getting-started/
If you go through our C# sample code and walkthrough you should be able to get up and running easily.
Please try this out and let us know how you get on. Best Wishes.