using System;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

​

​

namespace quize

{

    public class Program

    {

​

        public static void Main(string[] args)

        {

            List<string> names = GetNames();

​

            var firstLettersOfCompanyName = new HashSet<string>();

​

            foreach (var item in names)

            {

                firstLettersOfCompanyName.Add(item[0].ToString());

            }

​

            CultureInfo culture = new CultureInfo("sv-SE");

​

            foreach (var firstLetter in firstLettersOfCompanyName.OrderBy(x => x, StringComparer.Create(culture, false)))

            {

                Console.WriteLine(firstLetter.ToUpper() + ":");

​

                foreach (var company in names.Where(x => x.StartsWith(firstLetter)))

                {

                    Console.WriteLine(company);

                }

​

                Console.WriteLine("");

            }

​

        }

​

        private static List<string> GetNames()

        {

            var list = new List<string>();

​

            list.Add("Rilen Ventilation");

            list.Add("Karlshamn");

            list.Add("MSI");

            list.Add("VVS-Metoder");

            list.Add("Rohjanmaan");

            list.Add("ÅL-El");

            list.Add("Östersjö Elektriska");

            list.Add("Rörinstallation");

            list.Add("OvanEL");

            list.Add("Alovent");

            list.Add("APC");

            list.Add("Intec");

​

            return list;

        }

    }

}

​