How to pass a complex type object to a web service?

Question

Hi! I'm testing data transfer to a web service (using VS.NET 2k3 and c#) and I've observed the following: - passing and returning any simple type object works fine. - passing and returning any array of simple type objects works fine too. BUT - passing and returning any array of objects of this class: public class Type1 { protected int x; protected int y; public int X { get { return x; } } public int Y { get { return y; } } public Type1(int x,int y) { this.x = x; this.y = y; } } throws an exception. My question is how to pass this correctly. Maybe using XML, but how?? I'm a bit newbie on this. Thanks to anyone.