Get or sets the name with which the user data must be associated for the UserTrackingLocation to be matched.
Assembly: System.Workflow.Runtime (in System.Workflow.Runtime.dll)
An activity designer or a workflow designer can use either Activity.TrackData(String, Object) or ActivityExecutionContext.TrackData(String, Object) to associate a string key with the user data that is emitted in a user event. If is not a null reference (Nothing), the key associated with the user data must match the value of for the UserTrackingLocation to be matched. If is a null reference (Nothing), the runtime tracking infrastructure does not check for a matching key to determine whether the UserTrackingLocation is matched.