Check if values exist and for Null values when parsing XML?

How can I check if these values exist and if they are null? Here is the current code (as far as I could get with it):

Invoices.InvoiceRow[] invoiceRow = order.Elements(ns + "InvoiceRows")
.Elements(ns + "InvoiceRow")
.Select(e => new Invoices.InvoiceRow
{
ProductId = e.Element(ns + "ProductId").IsEmpty ? 0 : (int)e.Element(ns + "ProductId"),
RowId = e.Element(ns + "RowId").IsEmpty ? 0 : (int)e.Element(ns + "RowId"),
Price = e.Element(ns + "Price").IsEmpty ? decimal.Zero : (decimal)e.Element(ns + "Price"),
Name = e.Element(ns + "Name").IsEmpty ? string.Empty : (string)e.Element(ns + "Name"),
DiscountRate = e.Element(ns + "DiscountRate").IsEmpty ? decimal.Zero : (decimal)e.Element(ns + "DiscountRate"),
Quantity = e.Element(ns + "Quantity").IsEmpty ? decimal.Zero : (decimal)e.Element(ns + "Quantity"),
Cost = e.Element(ns + "Cost").IsEmpty ? decimal.Zero : (decimal)e.Element(ns + "Cost"),
InPrice = e.Element(ns + "InPrice").IsEmpty ? decimal.Zero : (decimal)e.Element(ns + "InPrice"),
})
.ToArray();

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Jordan JohnsonAsked:
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Fernando SotoRetiredCommented:
Hi Jordan;

To test to see if the node exist or not use == null. To see if that node has a value in the inner text use the IsEmpty. Also each element is a XML element and so if you want the inner text for that node use the Value property. The following modified code should work if I understand the question correctly.

Invoices.InvoiceRow[] invoiceRow = 
  order.Elements(ns + "InvoiceRows").Elements(ns + "InvoiceRow")
       .Select(e => new Invoices.InvoiceRow
           {
               ProductId = e.Element(ns + "ProductId") == null ? 0 : int.Parse(e.Element(ns + "ProductId").Value),
               RowId = e.Element(ns + "RowId") == null ? 0 : int.Parse(e.Element(ns + "RowId").Value),
               Price = e.Element(ns + "Price") == null ? decimal.Zero : decimal.Parse(e.Element(ns + "Price").Value),
               Name = e.Element(ns + "Name") == null ? string.Empty : e.Element(ns + "Name").Value,
               DiscountRate = e.Element(ns + "DiscountRate") == null ? decimal.Zero : decimal.Parse(e.Element(ns + "DiscountRate").Value),
               Quantity = e.Element(ns + "Quantity") == null ? decimal.Zero : decimal.Parse(e.Element(ns + "Quantity").Value),
               Cost = e.Element(ns + "Cost") == null ? decimal.Zero : decimal.Parse(e.Element(ns + "Cost").Value),
               InPrice = e.Element(ns + "InPrice") == null ? decimal.Zero : decimal.Parse(e.Element(ns + "InPrice").Value)
           })
       .ToArray();

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