XText

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;

class Program
{
    static void Main()
    {
        XElement summary = new XElement("summary",
        new XText("An XAttribute is "), new XElement("bold", "not"),
        new XText(" an XNode")
        );
        
        Console.WriteLine(summary);
    }
}