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// This interface informs the caller

// that the object's subitems can be enumerated.

public interface IEnumerable

{

IEnumerator GetEnumerator();

}

As you can see, the GetEnumerator() method returns a reference to yet another interface

named System.Collections.IEnumerator. This interface provides the infrastructure to allow the

caller to traverse the internal objects contained by the IEnumerable-compatible container:

// This interface allows the caller to

// obtain a container's subitems.

public interface IEnumerator

{

bool MoveNext ();        // Advance the internal position of the cursor.

object Current { get;}   // Get the current item (read-only property).

void Reset ();           // Reset the cursor before the first member.

}

If you wish to update the Garage type to support these interfaces, you could take the long road

and implement each method manually. While you are certainly free to provide customized versions

of GetEnumerator(), MoveNext(), Current, and Reset(), there is a simpler way. As the System.Array

type (as well as many other types) already implements IEnumerable and IEnumerator, you can sim-

ply delegate the request to the System.Array as follows:

using System.Collections;

...

public class Garage : IEnumerable

{