public ExtendedInvoice()
{
// this.id = -1;
this.FA_Number = "-1";
this.issue_date = new DateTime(0);
this.due_date = new DateTime(0);
this.Payment_Method = "-1";
this.subject_from = null;
this.subject_for = null;
this.items = new ArrayList();
}
public ExtendedInvoice(int id, string fa_number, DateTime issue_date, DateTime due_date, string payment_methode, ExtendedSubject subject_from, ExtendedSubject subject_for, ArrayList items)
{
this.Id = id;
this.FA_Number = fa_number;
this.issue_date = issue_date;
this.due_date = due_date;
this.Payment_Method = payment_methode;
this.subject_from = subject_from;
this.subject_for = subject_for;
this.items = items;
}