I have a SharePoint 2013 development environment. The Microsoft.SharePoint.dll assembly does not contain LimitedWebPartManager. I want to use a sandbox solution to provision a page and the web parts on it.
I'm not going insane: the LimitedWebPartManager class does not exist, and SPPage and the other classes don't have GetLimitedWebPartManager methods. I've checked with ILSpy/Reflector, the methods and classes are simply not there.
What gives, and what can I do instead?