Assembly: System.Data.Entity (in System.Data.Entity.dll)
When loading objects into the object context with the PreserveChanges option there is a difference in behavior between the .NET Framework version 4 and .NET Framework version 3.5 SP1. For more information see PreserveChanges and Identity Resolution, State Management, and Change Tracking (Entity Framework).
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.