Read a XML (from a string) and get some fields – Problems reading XML

     Use the LoadXml method, and not Load to read xml from string

xmlDoc.LoadXml(myXML);

     The method Load will try to load xml from a file and LoadXml from a string. Also we can use XPath,

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xml);
 
string xpath = "myDataz/listS/sog";
var nodes = xmlDoc.SelectNodes(xpath);
 
foreach (XmlNode childrenNode in nodes)
{
   HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("//field1").Value);
}

     Alternately use the Linq-XML,

XDocument doc = XDocument.Load(file);
 
var result = from ele in doc.Descendants("sog")
          select new
          {
             field1 = (string)ele.Element("field1")
          };
 foreach (var t in result)
 {
   HttpContext.Current.Response.Write(t.field1);
 }

     Else, get the node list of <sog> tag.

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(myXML);
XmlNodeList parentNode = xmlDoc.GetElementsByTagName("sog");
foreach (XmlNode childrenNode in parentNode)
  {
    HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("field1").InnerText);
  }

Try this code:

XDocument xdoc = new XDocument();
xdoc = XDocument.Parse(xml_string);

 string textXml = "<xmlroot><firstchild>value of first child</firstchild>........</xmlroot>";
        XElement xmlroot = XElement.Parse(textXml);
        string firstNodeContent = ((System.Xml.Linq.XElement)(xmlroot.FirstNode)).Value;

?xml version="1.0" encoding="utf-16"?>
<myDataz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <listS>
    <sog>
      <field1>123</field1>
      <field2>a</field2>
      <field3>b</field3>
    </sog>
    <sog>
      <field1>456</field1>
      <field2>c</field2>
      <field3>d</field3>
    </sog>
  </listS>

XDocument doc = XDocument.Load(file);

var result = from ele in doc.Descendants("sog")
              select new
              {
                 field1 = (string)ele.Element("field1")
              };
 foreach (var t in result)
  {
      HttpContext.Current.Response.Write(t.field1);
  }

 XmlDocument xmlDoc = new XmlDocument();
 xmlDoc.Load(myXML);
 XmlNodeList parentNode = xmlDoc.GetElementsByTagName("sog");
 foreach (XmlNode childrenNode in parentNode)
  {
    HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("field1").InnerText);
   }