ISharePointService.OnWorkflowItemChanged event

Raised when the item on which the workflow instance is running is changed.

Namespace:  Microsoft.SharePoint.Workflow
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

[CorrelationAliasAttribute("workflowId", "e.workflowId")]
event EventHandler<SPItemEventArgs> OnWorkflowItemChanged

You can add an OnWorkflowItemChanged workflow activity to your workflow to handle this event.

When the ISharePointService raises this event, the event parameters are contained in the SPItemEventArgs class.