In C#, you can easily using XmlDocument object to read the xml. The xml data can be a file or an xml string. You will find below xml document as an example. It will list a collections of books contain details like title, ISBN, publication date, author and price.

<?xml version="1.0" encoding="utf-8" ?>
<bookstore>
  <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">
    <title>The Autobiography of Benjamin Franklin</title>
    <author>
      <first-name>Benjamin</first-name>
      <last-name>Franklin</last-name>
    </author>
    <price>8.99</price>
  </book>
  <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
    <title>The Confidence Man</title>
    <author>
      <first-name>Herman</first-name>
      <last-name>Melville</last-name>
    </author>
    <price>11.99</price>
  </book>
  <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
    <title>The Gorgias</title>
    <author>
      <name>Plato</name>
    </author>
    <price>9.99</price>
  </book>
</bookstore>

Below is the sample code to read the xml document based on a file path location. Remember in order to use XmlDocument object, you will need to import System.Xml

XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("/bookplain.xml"));
XmlNode nodeResult = doc.SelectSingleNode("/bookstore");
if (nodeResult != null)
{
    XmlNodeList nodeList = doc.SelectNodes("/bookstore/book");
    foreach (XmlNode node in nodeList)
    {
        XmlNodeList childNodes = node.ChildNodes;
        foreach (XmlNode childNode in childNodes)
        {
            Console.WriteLine(childNode.Name  + " " +  childNode.InnerText);
        }
    }
}