ObjectQuery.MergeOption Property
Gets or sets how objects returned from a query are added to the object context.
Assembly: System.Data.Entity (in System.Data.Entity.dll)
If no MergeOption is specified, the default value is AppendOnly. For more information, see Change Tracking and Identity Resolution (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.