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copied!<p>Depends. Say your building will only ever have one elevator. You'd want to do something like this:</p> <pre><code>public class Building { public Elevator Elevator { get; set; } } </code></pre> <p>Then when you create the building like you did in your code above, you can do something like this:</p> <p><code>office.Elevator = new Elevator();</code></p> <p>You're new to C#, so you may not have really been exposed to <code>Properties</code> yet (<a href="http://msdn.microsoft.com/en-us/library/x9fsa0sw%28v=vs.100%29.aspx" rel="nofollow">more reading</a>). Cliffs on Properties: they're creating a way for you to get and set data <em>about</em> your object. In this example, we're getting/setting the <code>Elevator</code>.</p> <p>Now, if your building is going to have an unknown amount of elevators, you can't just write properties for Elevator1 to ElevatorInfinity. That's when you'll want to use a collection of some sort. As others have posted in here, you can do this like so:</p> <pre><code>public class Building { public IList<Elevator> Elevators { get; set; } } </code></pre> <p>And to add an elevator to your building:</p> <pre><code>// Make sure you instantiate the list! For practice, you should run this code without instantiating the list, so you can see what happens. office.Elevators = new List<Elevator>(); office.Elevators.Add(new Elevator()); </code></pre> <p><a href="http://msdn.microsoft.com/en-us/library/system.collections.ilist%28v=vs.100%29.aspx" rel="nofollow">More reading on IList</a></p>

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