Re: Retrieving unnecessary data

C) Remove the passengers field, and retrieve them with another call.

That's closer. You should *hide* all the fields, and retrieve them
whenever you need them.

I'd call GetCar(), and then if I want the passenger list, I'd call
GetPassengers(Car);

Or rather, car.GetPassengers();

It seems to me that more information is required to better answer this
question.
Imagine if, for example, the OP only needed passenger information if
the car was a "BMW", and he is looping through 1000 cars:

foreach (Car car in cars) {
if (car.Make == "BMW")
Console.Write( car.GetPassengers().Count );

This could cause *many* expensive web service calls!



D) Make 2 classes - Car and CarWithPassengers (that can derive from
Car).

We shot those people too.

If they are used in different use cases, why not subclass car just for
this use case? I think it would be a better alternative than lazy
loading since the OP is using expensive web service calls (see above).

Jordan



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