v9.0 (2011)

Returns the sum of the evaluation ID of itself plus all its children as a Long. The evaluation ID is a counter that is incremented each time the ProjectItem is evaluated (dirtied) by XSI. Note: returns -1 if the ProjectItem is not valid or there is an error. You can use this to detect whether a ProjectItem became dirty since the last time EvaluationID was called.

// get accessor Int32 rtn = ProjectItem.HierarchicalEvaluationID;