Example 2: The EntityReference class The EntityReference class is used to hold a reference to an entity that is related to another entity. Here is an example of how to use it:csharp using System.Entity; public class Person { public int ID { get; set; } public string Name { get; set; } public EntityReference Address { get; set; } } public class Address { public int ID { get; set; } public string Street { get; set; } public string City { get; set; } public string State { get; set; } } ``` In this example, the Person class has a reference to an Address entity, represented by the EntityReference class.