XML C#

using System;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass{
   public static void Main(){
        string xmlData ="" +
                                "5.5" +
                                "";
        
        XmlReader reader = XmlReader.Create(new StringReader(xmlData));
   }
}