[Supported in the .NET Framework 4.5.1 and later versions]
Gets the identifier of an activity that is related to the activity represented by the current instance.
Assemblies: System.Diagnostics.Tracing (in System.Diagnostics.Tracing.dll)
mscorlib (in mscorlib.dll)
The is a child of the ActivityId property. An activity ID can be associated with multiple related activity IDs.