using System;

using System.Xml;

public class Program

{

    public static void Main()

    {

        var innerDocument = new XmlDocument();

        innerDocument.LoadXml(@"<root></root>");

        innerDocument.DocumentElement.InnerText = "Foo & Bar";

        Console.WriteLine(innerDocument.OuterXml);

        var outerDocument = new XmlDocument();

        outerDocument.LoadXml(@"<root></root>");

        outerDocument.DocumentElement.InnerText = innerDocument.OuterXml;

        Console.WriteLine(outerDocument.OuterXml);

        var encodedText = outerDocument.DocumentElement.InnerText;

        string stringWanted = encodedText.Replace("&", "&");

        var reconstructedDocument  =new XmlDocument();

        reconstructedDocument.LoadXml(stringWanted);

        Console.WriteLine(reconstructedDocument.OuterXml);

        Console.WriteLine("Hello World");

    }

}