OnWorkflowActivated.WorkflowProperties property

Gets or sets an SPWorkflowActivationProperties object that represents the initial properties of the workflow as it starts, such as the user who added the workflow, and the list and item to which the workflow was added.

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

public SPWorkflowActivationProperties WorkflowProperties { get; set; }

The InitiationData property returns a string that represents the custom data provided by the workflow initiation form.