I want to know more about the new c# v6 functions....like the "using static" to import static classes

Answer 1

official docs are a good way to start. https://msdn.microsoft.com/en-us/library/sf0df423.aspx

Answer 2

is there any way i can get the offline version of the official documentation?

Answer 3

Honestly I didn't know you could but it looks like you can in visual studio. Here is explained how: https://blogs.msdn.microsoft.com/pakistan/2013/02/04/download-all-msdn-documentations-for-offline-access/