Hi @i1-dev, I am afraid your request falls outwith the scope of this forum which is created for the support of developers and users of the Tobii Eye Tracking hardware and software. We provide extensive tutorials and sample code to allow users to get up and running with their tracker using our SDK offerings.
However, to learn how to start programming for beginners in .NET, we would recommend one of the numerous free courses available online such as
https://dotnet.microsoft.com/learn
https://www.udemy.com/course/net-basic-course-introduction-to-net-with-csharp-programming/