XmlDocument is an in-memory representation of an XML document.
To save a document, call Save with a filename, Stream, TextWriter, or XmlWriter.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.Text;
using System.IO;
class Program
{
static void Main()
{
XmlDocument doc = new XmlDocument();
doc.Load("customer1.xml");
doc.Save("customer2.xml");
}
}