Windows Workflow Foundation 4 (WF4) Persistence

I've been working with Visual Studio 2010 Beta-2 to get some advanced learning on WF4. Everything was going fine until today, when I un-installed Visual Studio 2010 Beta-2, and installed the Visual Studio 2010 Release Candidate. My code is complaining that it can’t find the System.Runtime.Persistence namespace that I am using, and also, the InstanceStore, and Ins开发者_开发问答tanceView types contained in that namespace. Does anyone know if those types have been moved to a different namespace in the Release Candidate?

Isn't it in System.Runtime.DurableInstancing?

Protip: remove the reference to System.Runtime and then compile. The error message tells you what assembly to add.