Association between two classes is a very simple concept to understand. If you want to have association between ClassA and ClassB, then you can add a property of type ClassB on ClassA. This is the most basic form of association.
Associations come in four different forms as described next:
One-to-many: One end of the association has single instance of the entity while the other end has multiple instances. In code, this is represented by a property of the
Collectiontype. For example,IList<T>, [], ICollection<T>,IEnumerable<T>. and so onOne-to-one: Both ends of associations have one single instance of entities.
Many-to-many: Both ends of associations have multiple instances of entities.
We have example of all associations except many-to-many in our domain. Let me refer to part of the Employee class and the Benefit class as follows:
public class Employee : EntityBase
{
public virtual ICollection<Benefit>...