[Supported in the .NET Framework 4.5.1 and later versions]
Gets the activity ID of the current thread.
Assemblies: mscorlib (in mscorlib.dll)
System.Diagnostics.Tracing (in System.Diagnostics.Tracing.dll)
Windows Phone 8.1
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.