/// <summary>
/// Converts the invoice xml into SaleInvoice object.
/// </summary>
/// <param name="xmlInvoice">The xml that represents the invoices.</param>
/// <returns>An array of invoices.</returns>
/// <exception cref="XmlException">Thrown when xmlInvoice does not represent a valid XML text.</exception>
public static SalesInvoice[] GetInvoicesFromXml(string xmlInvoice)
{
List <SalesInvoice> invoices = InvoiceHelper.ConvertXmlToSaleInvoice(xmlInvoice);
return(invoices.ToArray());
}