The XML bills usually have one Node that is returned and parsed. We have come across an issue where an XML bill had multiple Nodes. Since the code is not set up to handle that, the customer ended up with an incorrect bill.

This is the code I have that goes through the bill list. If it comes back with a node then it parses the information from the xml.

```
    var response = new List<CustomerBill>();
    try
    {
        foreach (GetBillForCAResponse eBillResponse in eBillResponseList)
        {
            var statementDetailsResponse =   GetStatementDetails(
                new GetStatementDetailsRequest
                {
                   BatchId = eBillResponse.BatchId,
                   CustomerAccountId =    eBillResponse.CA.ToString("000000000"),
                   StatementId =   eBillResponse.CAS_NUM.ToString("0000")
                });

           string xmlBill = statementDetailsResponse.StatementAsXML.ToString();
           var document = new XmlDocument();
           document.LoadXml(xmlBill);

           var saDetailedPageNode = XmlBillParser.GetDetailPageSectionBySa(requestSa, xmlBill);
           if (saDetailedPageNode == null) continue;

           var customerBill = new CustomerBill();
           customerBill.IsSurepay = XmlBillParser.GetSurepayFlagFromBill(document);
           customerBill.ServiceAddress = XmlBillParser.GetServiceAddress(requestSa, document);
           customerBill.monthName = XmlBillParser.GetnillStatementDate(requestSa, xmlBill);
           customerBill.EqCurlPlanBal = XmlBillParser.getEqualizerCurrentPlanBalance(document);
           customerBill.EqPymntDue = XmlBillParser.getEqualizerPaymentDue(document);

           customerBill.Service = GetServiceAccountUsageAndBillingDetail(requestSa, xmlBill, saDetailedPageNode);
           response.Add(customerBill);
        }
    }
    catch (Exception ex)
    {
        trace.Write(new InvalidOperationException(requestSa, ex));
    }
    return response;
}

```

Here is the method that checks if there is a node in the XML. I have changed the code so that is returns all the nodes. I had to change the type xmlNode to xmlNodeList because now its returning a collection of nodes. \*\*\*\*This is whats causing all the problems in my code in other places.\*\*\*

```
public static xmlNode GetDetailPageSectionBySa(string sa, string statementXml)
{
    XmlDocument document = new XmlDocument();
    document.LoadXml(statementXml);
    string requestSa = sa.PadLeft(9, '0');
    string xpath = String.Format("//Para[IRBILGP_SA_SAA_ID_PRINT.SERVICE.ACCOUNT.STATMENT='{0}S{1}']/..", requestSa.Substring(0, 4), requestSa.Substring(4));
    return document.SelectNodes(xpath);
    //var nodes = document.SelectNodes(xpath);
   // if(nodes.Count > 0) return nodes[nodes.Count - 1];
    //if(!SaExistInBill(requestSa, statementXml)) return null;
    //var node = GetDetailPageSectionByBillPrisminfoIndex(sa, statementXml);
    //if (node != null) return node;
    //return null;
}

```

So returning back to where it is called.. im getting an invalid arguement here
`customerBill.Service = GetServiceAccountUsageAndBillingDetail(requestSA, xmlBill, saDetailedPageNode);` because the parameter `saDetailedPageNode` is `xmlNodeList` now when it is expecting of type `xmlNode`. if i go to the method `private static ServiceAddressBillDetail GetServiceAccountUsageAndBillingDetail(string requestSA, string xmlBill, XmlNode detailPageNode)` which i added at the end of this code so you could see. If I change the parameter `XmlNode detailPageNode` to `XmlNodeList detailPageNode` which I have to do to fix the invalid arguement above, I get that `detailPageNode.SelectNodes` becomes invalid because `xmlNodeList` does not have `SelectNodes` as an extension method. I use this extention method a lot through this method. So I am getting a lot of errors.

```
           var saDetailedPageNode = XmlBillParser.GetDetailPageSectionBySa(requestSa, xmlBill);
           if (saDetailedPageNode == null) continue;

           var customerBill = new CustomerBill();
           customerBill.IsSurepay = XmlBillParser.GetSurepayFlagFromBill(document);
           customerBill.ServiceAddress = XmlBillParser.GetServiceAddress(requestSa, document);
           customerBill.monthName = XmlBillParser.GetnillStatementDate(requestSa, xmlBill);
           customerBill.EqCurlPlanBal = XmlBillParser.getEqualizerCurrentPlanBalance(document);
           customerBill.EqPymntDue = XmlBillParser.getEqualizerPaymentDue(document);

           customerBill.Service = GetServiceAccountUsageAndBillingDetail(requestSa, xmlBill, saDetailedPageNode);
           response.Add(customerBill);
        }
    }
    catch (Exception ex)
    {
        trace.Write(new InvalidOperationException(requestSa, ex));
    }
    return response;
}
    private static ServiceAddressBillDetail GetServiceAccountUsageAndBillingDetail(string requestSA, string xmlBill, XmlNode detailPageNode)
    {
        var saBillDetail = new ServiceAddressBillDetail();
        saBillDetail.UsageServiceName = requestSA;

        var meterReadEndXMLNodes = detailPageNode.SelectNodes("Usage_kWh_b"); 

        if (meterReadEndXMLNodes.Count == 0)
        {
            meterReadEndXMLNodes = detailPageNode.SelectNodes("Usage_kWh_a");
        }
        if (meterReadEndXMLNodes.Count == 0)
        {
            meterReadEndXMLNodes = detailPageNode.SelectNodes("APSElec_kWh_b");
        }
        if (meterReadEndXMLNodes.Count == 0)
        {
            meterReadEndXMLNodes = detailPageNode.SelectNodes("APSElec_kWh_a");
        }

        var demandXMLNodes = detailPageNode.SelectNodes("Usage_kW_Total_Bold");

```

How can i fix my invalid arguments so that I can use xmlNodeList instead of xmlNode? is there a way to convert or cast? or is there another xml object I can use?

Since I am now returning multiple nodes. I know that I will need to loop through the `customerBill` portion. How can I do that without creating a new bill for every node? All the nodes in one xml need to be included in one bill.