What are the difference between Composition and Aggregation in C#?

Under Composition, if the parent object is deleted, then the child object also loses its status. The composition is a special type of Aggregation and gives a part-of relationship.

For example, A Car has an engine. If the car is destroyed, the engine is destroyed as well.

public class Engine {
   . . .
}

public class Car {
   Engine eng = new Engine();
   .......
}

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;

   }

   . . .

}