Reading XmlDocument fragment

I would like to loop through following collection of authors and for each author  retrieve its first and last name and put them in a variable strFirst and  strLast?

<Authors>  
  <Author>  
    <FirstName>Jon</FirstName>  
    <LastName>Doe</LastName>  
  </Author>  
  <Author>  
    <FirstName>Shahzad</FirstName>  
    <LastName>Khan</LastName>  
  </Author>  
</Authors>  

We’ll use XmlDocument class to parse this XML fragment;

using System;    
using System.Xml;    
public class XMLApp    
{    
    public void YourMethod(String strFirst, String strLast)    
    {    
        // Do something with strFirst and strLast.    
        // ...    
        Console.WriteLine("{0}, {1}", strLast, strFirst);    
    }    
    public void ProcessXML(String xmlText)    
    {    
        XmlDocument _doc = new XmlDocument();    
        _doc.LoadXml(xmlText);    
        // alternately, _doc.Load( _strFilename); to read from a file.    
        XmlNodeList _fnames = _doc.GetElementsByTagName("FirstName");    
        XmlNodeList _lnames = _doc.GetElementsByTagName("LastName");    
        // I'm assuming every FirstName has a LastName in this example, your requirements may vary. //     
        for (int _i = 0; _i < _fnames.Count; ++_i)    
        {    
            YourMethod(_fnames[_i].InnerText,    
            _lnames[_i].InnerText);    
        }    
        public static void Main(String[] args)    
        {    
            XMLApp _app = new XMLApp();    
            // Passing XML text as a String, you can also use the    
            // XMLDocument::Load( ) method to read the XML from a file.    
            //    
            _app.ProcessXML(@" <Authors>    
            <Author>    
              <FirstName>John</FirstName>    
              <LastName>Doe</LastName>    
            </Author>    
            <Author>    
              <FirstName>Shahzad</FirstName>    
              <LastName>Khan</LastName>    
            </Author>    
            </Authors> ");    
        }    
    }// end XMLApp    
}  

Resources

https://learn.microsoft.com/en-us/dotnet/api/system.xml.xmldocument?view=net-7.0

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