Adding the namespaces

Now, we will make code as follows. We'll need the LINQ and generic collections namespaces; so, enter the following under using System near the top of the file:

using System.Linq;
using System.Collections.Generic;

Creating the person and car classes

We'll make two classes. One will be a person and the other will be a car class. To do this, enter the following directly above the line that begins with public partial class _Default...:

public class Person

Now, we need just a name; so, enter the following between a set of curly braces below this line:

public string Name { get; set; }

Then, we also need to make a class called Car. So, beneath the closed curly brace underneath the preceding line, enter the following:

public class Car

Next, enter the following between a set of curly braces below this line:

public Person Owner { get; set; }

As you can see now, public Person is being defined inside the class as a data type of a field. For example, a car has an owner.

Now, add one more data...