Microsoft Docs has succeeded MSDN as the source for documentation on Microsoft development. As you're using an old version of VS, your MSDN documentation would still be valid, but it's probably easier to use the online Docs site. Whenever I want specifics regarding types or members, I always go straight to the API documentation:

https://docs.microsoft.com/en-au/dot...tframework-4.8

That defaults to .NET Framework 4.8 but you can modify the query string or remove it to default to all APIs.