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How Can I Parse an XML file using XmlNodeList

I have been tasked with taking one XML file and converting it to a new XML I have no experience working with XML documents but I have been able to get some of the data from the first XML document using the code shown below. Note not all code is being shown just a small example.
XmlDocument rssXmlDoc = new XmlDocument();
// Load the RSS file from the RSS URL
rssXmlDoc.Load("https://agency.governmentjobs.com/jobfeed.cfm?agency=ocso");
// Setup name space
XmlNamespaceManager nsmgr = new XmlNamespaceManager(rssXmlDoc.NameTable);
nsmgr.AddNamespace("joblisting", "http://www.neogov.com/namespaces/JobListing");
// Parse the Items in the RSS file
XmlNodeList rssNodes = rssXmlDoc.SelectNodes("rss/channel/item/");
// Iterate through the items in the RSS file
foreach (XmlNode rssNode in rssNodes)
{
XmlNode rssSubNode = rssNode.SelectSingleNode("title");
string title = rssSubNode != null ? rssSubNode.InnerText : "";
using this code I am able to get most of the elements. I have run into a wall when trying to get data from a child element. The portion of the XML I cannot get is shown below.
<joblisting:department>Supply</joblisting:department>
<guid isPermaLink="true">https://www.governmentjobs.com/careers/ocso/Jobs/2594527</guid>
<joblisting:categories>
<joblisting:category xmlns:joblisting="http://www.neogov.com/namespaces/JobListing" xmlns:atom="http://www.w3.org/2005/Atom">
<CategoryCode>ClericalDataEntry</CategoryCode>
<Category>Clerical & Data Entry</Category>
</joblisting:category>
<joblisting:category
</joblisting:categories>
But I cannot get all of the data. How can I get the value for the element that starts with guid isPermaLink="true"
For the joblisting:categories I have used a foreach loop to read those values
foreach (var item in rssSubNode.SelectNodes("joblisting:categories", nsmgr))
{
rssSubNode = rssSubNode = rssNode.SelectSingleNode("joblisting:category", nsmgr);
string category = rssSubNode != null ? rssSubNode.InnerText : "";
}
How can read the values of those child elements?

To read guid node you can use the follow code. note that use selectSingleNode in node contains the "item" node.
public static void test() {
XmlDocument rssXmlDoc = new XmlDocument();
// Load the RSS file from the RSS URL
rssXmlDoc.Load("https://agency.governmentjobs.com/jobfeed.cfm?agency=ocso");
// Setup name space
XmlNamespaceManager nsmgr = new XmlNamespaceManager(rssXmlDoc.NameTable);
nsmgr.AddNamespace("joblisting", "http://www.neogov.com/namespaces/JobListing");
// Parse the Items in the RSS file
XmlNodeList rssNodes = rssXmlDoc.SelectNodes("rss/channel/item");
// Iterate through the items in the RSS file
foreach (XmlNode rssNode in rssNodes) {
var xmlnode = rssNode.SelectSingleNode("guid ");
System.Console.WriteLine("the value of guid is =>" + xmlnode.InnerText);
XmlNode rssSubNode = rssNode.SelectSingleNode("title");
string title = rssSubNode != null ? rssSubNode.InnerText : "";
}
}

Adding a node in the beginning of XML parent node

I wanted to add a xmlNode in a parent but at the top/beginning. Is there a variant of XMLNode.AppendChild() that i can use?

As far as I understand your question you are probably looking for the XmlNode.PrependChild() method.
Example:
XmlDocument doc = new XmlDocument();
XmlNode root = doc.DocumentElement;
//Create a new node.
XmlElement node = doc.CreateElement("price");
//Add the node to the document.
root.PrependChild(node);
MSDN documentation

I believe the question is asking how to add a node to the beginning of the XML file. I did that in the following manner:
// This is the main xml document
XmlDocument document = new XmlDocument();
// This part is creation of RootNode, however you want
XmlNode RootNode = document.CreateElement("Comments");
document.AppendChild(RootNode);
//Adding first child node as usual
XmlNode CommentNode1 = document.CreateElement("UserComment");
RootNode.AppendChild(commentNode1);
//Now create a child node and add it to the beginning of the XML file
XmlNode CommentNode2 = document.CreateElement("UserComment");
RootNode.InsertBefore(commentNode2, RootNode.FirstChild);

Reading XML nodes causing issues

I have one XML string, I am trying to read that using C#, but I am not getting child nodes. I am getting entire XML as inner XML string. I am not able to read the nodes. Here is my XML string and my code.
<Filters FilterName="706337_test">
<MemberName>Dorvil</MemberName>
<MemberId />
<ProviderName />
<ProviderId>706337</ProviderId>
<SelectedProjects>5030003</SelectedProjects>
<CNAChartSelected>false</CNAChartSelected>
<OldProject>false</OldProject>
</Filters>
C# code trying to read the XML nodes
XmlDocument xml = new XmlDocument();
xml.LoadXml(xmlstring);
XmlNodeList xnList = xml.SelectNodes("/Filters");
I can see only one child node that too filters, I need to read MemberId, MemberName etc., how to read them?

This is because your string in SelectNodes is wrong:
var xml = new XmlDocument();
xml.LoadXml(xmlstring);
var xnList1 = xml.SelectNodes("/Filters"); //list of 1 element
var xnList2 = xml.SelectNodes("/Filters/*"); //list of 7 elements
foreach (XmlNode node in xnList2)
{
Console.WriteLine(node.OuterXml);
}
Also you can use this:
var xElements = XElement.Parse(xmlstring).Elements();
foreach (var element in xElements)
{
Console.WriteLine(element);
}

You need to tell the app which nodes to read..
XmlDocument xml = new XmlDocument();
xml.LoadXml(xmlstring);
XmlNodeList xnList = xml.SelectNodes("/Filters");
foreach (XmlNode node in xnList)
{
string memberName = node["MemberName"].InnerText;
}
This lets the app know to read what is inside the MemberName node.. Do the same for the other nodes and post back your results. Debug as you go to see what you are getting out of each node.

inserting xml element into multiple nodes

I have the following XML
<ROOT>
<FSM338_Container>
<FSM338_Details>
<RunDate>2013-05-29 09:43:00</RunDate>
<Uic>21690</Uic>
<Date>2013-06-10 00:00:00</Date>
<CASHBREAK>199</CASHBREAK>
<CASHLUNCH>199</CASHLUNCH>
</FSM338_Details>
<FSM338_Details>
<RunDate>2013-05-29 09:43:00</RunDate>
<Uic>21690</Uic>
<Date>2013-06-10 00:00:00</Date>
<CASHBREAK>199</CASHBREAK>
<CASHLUNCH>199</CASHLUNCH>
</FSM338_Details>
</FSM338_Container>
<BillingReport>
<RunDate>2013-05-29 09:43:00</RunDate>
<Uic>21690</Uic>
<Date>2013-06-10 00:00:00</Date>
<gaindacd>1</gaindacd>
<docnum>07000F</docnum>
</BillingReport>
<DataElements>
<unitid>12345</unitid>
<fbocost>0.00</fbo>
</DataElements>
</ROOT>
I need to load the xml doc and add in several elements whenever I find the element named "Uic" . In short if I find "Uic" add in the element <someElement>my stuff here</someElement> at the same level as UIC at all locations.
I'Ve used
XmlDocument xDoc = new XmlDocument();
xDoc.Load(#"path_to_xml.xml");
list = xDoc.GetElementsByTagName("Uic");
I used insertBefore to add in my element but I can get it to copy to only the first element

You can use SelectNodes() method of XmlNode which accepts xpath expression.
XmlNodeList nodes = xDoc.DocumentElement.SelectNodes("Uic");
foreach(XmlNode node in nodes) {
XmlElement element = xDoc.CreateElement("SomeElement");
element.InnerText = "anything";
node.ParentNode.AppendChild(element);
}

How to create a path to xml element in C#

I want to create a routing(path) to xml element and assign it to a variable so i can access it
fast in the future.
The element, which is a child of other elements, can change its position in the document
so i cant use methods like first child or indexing that rely on position.
The path to the element will always stay constant and there is no other path like it.
If we look at a short example so i want a path to level4 value(header4) so i can modify it.
<level1>
<level2>
<level3>header3</level3>
<level4>header4</level4>
<level3>header31</level31>
</level2>
<level2>
<level3>nnn</level3>
<level3>nnnnn</level31>
</level2>
</level1>

You've got to use XPath in that case.
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("Path of the xml");
XmlNode titleNode = xmlDoc.SelectSingleNode("//level1/level2/level3");

You can use XPath for this.
XmlDocument doc; // assuming the xml is already in doc
XmlNode node = doc.SelectSingleNode("/level1/level2/level3/level4");
if(node != null)
{
node.InnerText = "New value";
}
If there could be more than one level4 then you could do this:
XmlDocument doc; // assuming the xml is already in doc
XmlNodeList nodes = doc.SelectNodes("/level1/level2/level3/level4");
if(nodes != null)
{
foreach(XmlNode node in nodes)
{
node.InnerText = "New value";
}
}