using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Xml;

using System.Xml.Linq;

​

namespace Sample

{

    public class Program

    {

        public static void Main(string[] args)

        {

​

            var lst = new List<Assinante>(){new Assinante

            {

                City= "BAURU",

                Num= 112,

                ClientCode= 3123,

                Phone= "1412345675"

            },

            new Assinante

            {

                City= "BAURU",

                Num= 45,

                ClientCode= 3123,

                Phone= "214464347"

            }};

            var html =  new XElement("div", new XAttribute("class","dynamic-content"), 

                            from i in lst.GroupBy(x=>new{x.City,x.ClientCode,x.Num}) select 

                                new XElement("div",new XAttribute("class","city"),

                                new XElement("h1",new XAttribute("class","city-name"), i.Key.City ),

                                new XElement("ul",

                                    from k in i.GroupBy(a=>a.ClientCode) select

                                            new XElement("li", 

                                                new XAttribute("class","client-code"), k.Key,

                                                new XElement("ul",

                                                    from j in k.GroupBy(a=>a.Num) select 

                                                        new XElement("li", 

                                                            new XAttribute("class","client-num"), j.Key ,

                                                            new XElement("ul", new XAttribute("class","phone-numbers"), 

                                                                from l in j select 

                                                                    new XElement("li", new XAttribute("class","phone-number"), l.Phone)

                                                        )

                                                    )

                                                )

                                            )

                                    )

                                )

                            );

​

            Console.WriteLine(html);

        }

        private class Assinante

        {

            public string City;

            public int Num;

            public int ClientCode;

            public string Phone;

        }

    }

}