private void FixupCustomer(Customer previousValue)
{
if (previousValue != null && previousValue.Invoices.Contains(this))
{
previousValue.Invoices.Remove(this);
}
if (Customer != null)
{
if (!Customer.Invoices.Contains(this))
{
Customer.Invoices.Add(this);
}
if (CustomerId != Customer.CustomerId)
{
CustomerId = Customer.CustomerId;
}
}
}
