Hi @i1-dev, as you are new to the project, then we recommend that you use instead the Tobii Interaction Library which you can download @ https://developer.tobii.com/product-integration/interaction-library/
which contains a number of walkthroughs and tutorials with sample code for C# as described @ https://developer.tobii.com/product-integration/interaction-library/getting-started/
Please check it out and let us know you get on. Best Wishes.