Adds the specified collection with entities as work to delete. All entities in the graph added which are on the FK sides of relationships are deleted. (so which are depending entities on entities also in the graph contained by toAdd)

Adds the specified relationship as an edge to use for a cascade delete. The start entity of the relationship specified (example: CustomerEntity.Relationships.OrderEntityUsingCustomerID: CustomerEntity is the start entity) has to be the PK side. The FK side is then deleted before the PK side is deleted.

Adds the specified relationship as an edge to use for a cascade action. The start entity of the relationship specified (example: CustomerEntity.Relationships.OrderEntityUsingCustomerID: CustomerEntity is the start entity) has to be the PK side. The FK side is then worked on when the PK side is deleted. If cascadeAction is update, the FK fields are reset before the pk side is deleted: to a default value if not nullable, or to null if nullable. If cascadeAction is delete, the FK side is deleted before the pk side is deleted