Orcas: Thread.CurrentThread.Name
Looks like Orcas beta1 set Thread.CurrentThread.Name to “vshost.Run” when an application is debugged via Visual Studio – attempting to set this property generate the exception “This property has already been set and cannot be modified”.
Tales from a Trading Desk 
This has been fixed in Orcas Beta 2, which should be out in the next month.
Judd Hall
Program Manager
Common Language Runtime