using System;
using System.Linq;
using System.Xml.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass{
public static void Main(){
XElement root = new XElement("Root",
new XAttribute("Att1", 1),
new XAttribute("Att2", 2),
new XAttribute("Att3", 3)
);
root.ReplaceAttributes(
new XAttribute("NewAtt1", 101)
);
Console.WriteLine(root);
}
}