Here is my simple implementation on XML parser for XML which I recive from server response. Also I've tried to use XmlPathDocument but falied to get child elements for node in XmlPathIterator. Thanks a lot for any advices for code improvement!

Here is my simple implementation on XML parser for XML which I received from a server response. Also I've tried to use XmlPathDocument but failed to get child elements for a node in XmlPathIterator.

    public OutboxResponse CheckSendResponseForOutboxPacket(Outbox )
    {           
        var responseContent = outbox.Outbox_content.FirstOrDefault().response_content;

        OutboxResponse outboxResponse = new OutboxResponse();
        outboxResponse.Violations = new List<OutboxResponseViolation>();

        XmlDocument responseDocument = new XmlDocument();
        responseDocument.LoadXml(responseContent);
        var rootElement = responseDocument.DocumentElement;
        
        //XPath templates
        string responseResult = "r:body/r:result/text()";            
        string violationCode = "g:body/g:code/text()";
        string violationLevel = "g:body/g:level/text()";
        string violationName = "g:body/g:name/text()";
        string violationDescription = "g:body/g:violations/g:violation";      
        string itemResultResult = "g:body/g:itemResults/g:itemResult/g:result/text()";
        string itemResultViolations = "g:body/g:itemResults/g:itemResult/g:violations/g:violation";


        XmlNamespaceManager nsmanager = new XmlNamespaceManager(responseDocument.NameTable);
        nsmanager.AddNamespace("g", "http://google.com");

  
        switch (rootElement.SelectSingleNode(responseResult, nsmanager).Value)
        {
            case "success":
                outboxResponse.Result = "Packet received without errors";

                foreach (XmlNode violation in rootElement.SelectNodes(itemResultViolations, nsmanager))
                {
                    outboxResponse.Violations.Add(new OutboxResponseViolation
                    {
                        Level = violation.SelectSingleNode("g:level/text()", nsmanager).Value,
                        Name = violation.SelectSingleNode("g:name/text()", nsmanager).Value,
                        Description = violation.SelectSingleNode("g:description/text()", nsmanager).Value

                    });

                }


                break;
            case "failure":
                outboxResponse.Result = "Errors was found in packet";

                foreach (XmlNode violation in rootElement.SelectNodes(violationDescription, nsmanager))
                {
                    outboxResponse.Violations.Add(new OutboxResponseViolation
                    {
                        Level = violation.SelectSingleNode("r:level/text()", nsmanager).Value,
                        Name = violation.SelectSingleNode("r:name/text()", nsmanager).Value,
                        Description = violation.SelectSingleNode("r:description/text()", nsmanager).Value

                    });

                }

                break;
        }


        return outboxResponse;

    }

    public OutboxResponse CheckSendResponseForOutboxPacket(Outbox outbox)
    {           
        var responseContent = outbox.Outbox_content.FirstOrDefault().response_content;

        OutboxResponse outboxResponse = new OutboxResponse();
        outboxResponse.Violations = new List<OutboxResponseViolation>();

        XmlDocument responseDocument = new XmlDocument();
        responseDocument.LoadXml(responseContent);
        var rootElement = responseDocument.DocumentElement;
        
        //XPath templates
        string responseResult = "r:body/r:result/text()";            
        string violationCode = "g:body/g:code/text()";
        string violationLevel = "g:body/g:level/text()";
        string violationName = "g:body/g:name/text()";
        string violationDescription = "g:body/g:violations/g:violation";      
        string itemResultResult = "g:body/g:itemResults/g:itemResult/g:result/text()";
        string itemResultViolations = "g:body/g:itemResults/g:itemResult/g:violations/g:violation";


        XmlNamespaceManager nsmanager = new XmlNamespaceManager(responseDocument.NameTable);
        nsmanager.AddNamespace("g", "http://google.com");

  
        switch (rootElement.SelectSingleNode(responseResult, nsmanager).Value)
        {
            case "success":
                outboxResponse.Result = "Packet received without errors";

                foreach (XmlNode violation in rootElement.SelectNodes(itemResultViolations, nsmanager))
                {
                    outboxResponse.Violations.Add(new OutboxResponseViolation
                    {
                        Level = violation.SelectSingleNode("g:level/text()", nsmanager).Value,
                        Name = violation.SelectSingleNode("g:name/text()", nsmanager).Value,
                        Description = violation.SelectSingleNode("g:description/text()", nsmanager).Value

                    });

                }


                break;
            case "failure":
                outboxResponse.Result = "Errors was found in packet";

                foreach (XmlNode violation in rootElement.SelectNodes(violationDescription, nsmanager))
                {
                    outboxResponse.Violations.Add(new OutboxResponseViolation
                    {
                        Level = violation.SelectSingleNode("r:level/text()", nsmanager).Value,
                        Name = violation.SelectSingleNode("r:name/text()", nsmanager).Value,
                        Description = violation.SelectSingleNode("r:description/text()", nsmanager).Value

                    });

                }

                break;
        }


        return outboxResponse;

    }