MVC Razor view Intellisense broken in VS 2013/2015/2017

Question

I have an existing project written in VS2010 which when loaded in VS2010 works perfectly.

When I load this same project in VS2013 the MVC Razor views contain lots of

Answer 1

For anyone else who might stumble across this I didn't find any of the previous answers to really solve my problem or not pertain to it. Anyways the way that solved this for me and made intellisense work again was to go to my bin folder and delete all the files in there and then clean/rebuild and it was fixed.