C#

using System;
using System.Xml;

public class Program
{
    public static void Main()
    {
        var LanguageDoc = new XmlDocument();
        LanguageDoc.LoadXml(@"<language>
  <main>
    <aboutlink>About</aboutlink>
    <registrationlink>Registration</registrationlink>
    <loginlink>Enter</loginlink>
  </main>
  <about>
    <description>This site is about friends and games </description>
  </about>
</language>");

        XmlNode root = LanguageDoc.DocumentElement;
        XmlNode main = root.SelectSingleNode("/language/main");
        XmlNode about = main.SelectSingleNode("aboutlink");
        Console.WriteLine("About: {0}", about == null ? "NULL" : about.InnerText);
        XmlNode registration = main.SelectSingleNode("registrationlink");
        Console.WriteLine("Registration: {0}", registration == null ? "NULL" : registration.InnerText);
        XmlNode login = main.SelectSingleNode("loginlink");
        Console.WriteLine("Login: {0}", login == null ? "NULL" : login.InnerText);
    }
}
/*
Output:
About: About
Registration: Registration
Login: Enter
*/

String LanguageFileName = "\\Language" + Session["Language"].ToString() + ".xml";

fPath = Path.GetDirectoryName(new Uri(Assembly.GetExecutingAssembly().GetName().CodeBase).LocalPath);
 
fPath += LanguageFileName;
XmlDocument LanguageDoc = new XmlDocument();

var LanguageDoc = new XmlDocument();
LanguageDoc.Load(fPath);

XmlNode root = LanguageDoc.DocumentElement;
XmlNode main = root.SelectSingleNode("/language/main");
XmlNode about = main.SelectSingleNode("aboutlink");
Console.WriteLine("About: {0}", about == null ? "NULL" : about.InnerText);
XmlNode registration = main.SelectSingleNode("registrationlink");
Console.WriteLine("Registration: {0}", registration == null ? "NULL" : registration.InnerText);
XmlNode login = main.SelectSingleNode("loginlink");
Console.WriteLine("Login: {0}", login == null ? "NULL" : login.InnerText);

/*
Output:

About: About
Registration: Registration
Login: Enter
*/

XML Declaration - MSDN[^]

The XML declaration is not required, however, if used it must be the first line in the document and no other content or white space can precede it.

<?xml version="1.0" encoding="utf-8" ?>