using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var org1 = new Org(1, "Timisoara");

        var org2 = new Org(2, "Cimisoara");

        var org3 = new Org(3, "Timisoara");

        var org4 = new Org(4, "Topolovat");

        var orgList = new List<Org> { org1, org2, org3, org4 };

        var filteredOrganizationsByCustomerCity = orgList

                .ToLookup(o => o.City == "Timisoara", o => o)

                .OrderBy(g => g.Key)

                .ThenBy(g => g.Select(o => o.City))

                .SelectMany(g => g.Select(o => o));

        foreach(var org in filteredOrganizationsByCustomerCity)

        {

            Console.WriteLine(org.City);

        }

    }

    public class Org

    {

        public Org(int id, string city)

        {

            Id = id;

            City = city;

        }

        public string City {get; set;}

        public int Id {get; set;}

    }

}