What is aggregation in C#?

Aggregation is a directional relation between objects in C#. It is the relationship between objects.

For example, Employee and Address

An Employee is associated with a single Department, whereas a Department can have more than one employee. Let us see an example of Employee and Address −

public class Address {    . . . } public class Employee {    private Address addr;    public Employee (Address addr) {       this.addr = addr;    }    . . . }