I have a content type that I am needing to add a new column to. This new column is a boolean field and by default it is set to False. Now, I already have alot of items in the existing list, so each of these will need to be updated as well with the default value of the field, but how would I do that? Do I do that in the Event Receiver of the Feature object? And under which method would I do that under: FeatureActivated or FeatureUpgrading?