Create Event Handlers Workflow

Event handlers are used to execute business logic at specific points in the life of a
workflow. They can be implemented at the workflow level, for example when the
workflow is started or completed, or at an element level, for example when
anyone approves or rejects a step in the approval.

Event handlers are implemented by creating a class that implements one or more
of the EventHandler interfaces. The interfaces at the workflow level are as
follows:

Event	Description
WorkflowStarted EventHandler	This event occurs when the workflow instance starts.
WorkflowCompleted EventHandler	This event occurs when the workflow instance ends after it is completed.

WorkflowCanceled EventHandler	This event occurs when the workflow instance ends after it is canceled. Use this event handler to perform any clean up operations needed.
WorkflowConfig DataChangeEvent Handler	This event occurs when a workflow changes. Use this event handler to identify when a workflow has changed. For example, if you create an association between the application data and a workflow, this event would be raised if the workflow was deleted or updated so that application code could be invoked or respond in some way.

Best Regards,
Hossein Karimi