Binding more than one Custom Class (Business Entity) to Crystal Report

[hcnielsen]

Hello
I have problems to bind more than one Custom Class(Business Entity) to Crystal Report (There is no direct access to the database, instead we use a n-tier approach).
To give an example, I want to make an Invoice with an InvoiceHead and an ArrayList of InvoiceDetails. The code in C# for these Custom Classes(Business Entities) are as follows:

public class InvoiceHead
{
public int InvoiceHeadID { get; set; }
public string InvoiceHeadCustomerName { get; set; }
}
public class InvoiceDetail
{
public int InvoiceHeadID { get; set; }
public int InvoiceDetailID { get; set; }
public string InvoiceDetailProduct { get; set; }
public int InvoiceDetailPrice { get; set; }
}

I manage to show the InvoiceDetail by using the SetDataSource method to the ArrayList of InvoiceDetail, but how do I get the data in the object of InvoiceHead to show on my Crystal Report?
I am a newbie to Crystal Reports and any help would be appreciated (in C#)