Hi @devi, I am afraid that for the time being Tobii does not produce Javascript bindings for the Tobii Core SDK (which works with both the C4 & EyeX Controller).
Regarding WPF examples for the Tobii Core SDK, there is included a significant number of code samples available @
https://github.com/Tobii/CoreSDK/tree/master/samples &
https://github.com/Tobii/interaction-samples
With a getting started guide @
https://tobii.github.io/CoreSDK/articles/wpf.html
Hopefully this is exactly the information you are looking for!