ActivityExecutionContext.CancelActivity Method (Activity)
Called by a composite activity to schedule the cancellation of a child activity. The workflow runtime disallows cancellation of a child activity that is not in the Executing state.
Assembly: System.Workflow.ComponentModel (in System.Workflow.ComponentModel.dll)
activity is null.
The ActivityExecutionContext has been disposed.
activity is not in the Executing state.
Available since 3.0