Adds an object to the related end.
An entity instance to add to the related end.
If the source entity object is attached to a cache, then all the connected ends are added to the object cache and their corresponding relationships are also added to the ObjectStateManager. The RelatedEnd of the relationship is also fixed.
IRelatedEnd.Add OverloadRelatedEnd ClassSystem.Data.Objects.DataClasses NamespaceDefining and Managing RelationshipsLoading Related ObjectsAttaching and Detaching Objects