<Numbers>
    <Number parity="o">1</Number>
    <Number parity="p">2</Number>
    <Number parity="o">3</Number>
    <Number parity="p">4</Number>
    <Number parity="o">5</Number>
</Numbers>
// selecting top nodes, XPath
XmlDocument xml = new XmlDocument();
xml.LoadXml(str); // XML file
XmlNodeList nodes = xml.SelectNodes("/Numbers/Number[position() <= 5]");

foreach (XmlNode node in nodes)
{
  Console.WriteLine(node.InnerText);
}

// selecting nodes based on the value of nodes attribute
XmlDocument xml = new XmlDocument();
xml.LoadXml(str);
XmlNodeList xnList = xml.SelectNodes("/Numbers/Number[@parity='p']");

foreach (XmlNode xn in xnList)
{
  Console.WriteLine(xn.InnerText);
}

<Names>
    <Name>
        <FirstName>Dean</FirstName>
        <LastName>Milojevic</LastName>
    </Name>
    <Name>
        <FirstName>Some</FirstName>
        <LastName>One</LastName>
    </Name>
</Names>
// selecting by name of node
XmlDocument xml = new XmlDocument();
xml.LoadXml(myXmlString);
XmlNodeList xnList = xml.SelectNodes("/Names/Name");

foreach (XmlNode xn in xnList)
{
  string firstName = xn["FirstName"].InnerText;
  string lastName = xn["LastName"].InnerText;
  Console.WriteLine("Name: {0} {1}", firstName, lastName);
}