/// <summary>
        /// Representing method used for load data
        /// </summary>
        public static void LoadData()
        {
            string lineDrzava;
            string lineWorldCup;

            StreamReader citacDrzava = File.OpenText(lokacija + "\\" + "data" + "\\" + "drzave.csv");

            while ((lineDrzava = citacDrzava.ReadLine()) != null)
            {
                Drzava drzava = new Drzava(lineDrzava);
                listaDrzava.Add(drzava.ID, drzava);
            }

            citacDrzava.Close();

            StreamReader citacSvetskihPrvenstava = File.OpenText(lokacija + "\\" + "data" + "\\" + "svetskaPrvenstva.csv");

            while ((lineWorldCup = citacSvetskihPrvenstava.ReadLine()) != null)
            {
                SvetskoPrvenstvo worldCup = new SvetskoPrvenstvo(lineWorldCup, listaDrzava);
                listaSvetskihPrvenstva.Add(worldCup.ID, worldCup);
            }

            citacSvetskihPrvenstava.Close();
        }
        /// <summary>
        /// Representing method which allow user to add or change world cup
        /// </summary>
        public static void AddOrChangeWorldCup()
        {
            Console.WriteLine("1.Add");
            Console.WriteLine("2.Change");
            Console.Write("Options:");
            int option = Helper.CheckID();

            switch (option)
            {
            case 1:
                Console.Clear();
                Console.Write("Enter the name of the world cup:");
                string naziv = Helper.CheckString();

                Console.Clear();

                Console.Write("Enter the year of the world cup:");
                int yearAdd = Helper.CheckID();

                Console.Clear();

                WriteAllCountrys();
                Console.Write("Enter the id of the \"Domacin\":");
                int idDrzaveDomacina = Helper.CheckID();

                if (listaDrzava.ContainsKey(idDrzaveDomacina))
                {
                    Drzava           drzavaDomacin       = listaDrzava[idDrzaveDomacina];
                    SvetskoPrvenstvo svetskoPrvenstvoAdd = new SvetskoPrvenstvo {
                        ID = listaSvetskihPrvenstva.Keys.Max() + 1, Naziv = naziv, Domacin = drzavaDomacin, Godina = yearAdd
                    };
                    listaSvetskihPrvenstva.Add(svetskoPrvenstvoAdd.ID, svetskoPrvenstvoAdd);

                    Console.Clear();
                    Console.WriteLine("Svetsko prvenstvo je uspesno dodato!");
                }
                else
                {
                    Console.WriteLine("That ID does not exits!");
                }

                SaveWorldCups();

                Console.WriteLine("Press any key to continue...");
                Console.ReadLine();
                Console.Clear();
                break;

            case 2:
                Console.Clear();
                WriteAllWorldCups();
                Console.Write("Enter the ID of the world cup which you want edit:");
                int idSelect = Helper.CheckID();

                Console.Clear();

                if (listaSvetskihPrvenstva.ContainsKey(idSelect))
                {
                    SvetskoPrvenstvo svetskoPrvenstvo = listaSvetskihPrvenstva[idSelect];

                    Console.Write("Enter the name of the world cup:");
                    string nazivEdit = Helper.CheckString();

                    Console.Clear();

                    Console.Write("Enter the year of the world cup:");
                    int yearEdit = Helper.CheckID();

                    Console.Clear();

                    WriteAllCountrys();
                    Console.Write("Enter the ID of the \"Domacin\":");
                    int idDomacin = Helper.CheckID();

                    Console.Clear();

                    if (listaDrzava.ContainsKey(idDomacin))
                    {
                        Drzava drzavaDomacinEdit = listaDrzava[idDomacin];
                        svetskoPrvenstvo = new SvetskoPrvenstvo {
                            ID = idSelect, Naziv = nazivEdit, Godina = yearEdit, Domacin = drzavaDomacinEdit
                        };
                        listaSvetskihPrvenstva[idSelect] = svetskoPrvenstvo;

                        SaveWorldCups();

                        Console.Clear();
                        Console.WriteLine("Svetsko prvenstvo je uspesno dodato!");
                    }
                    else
                    {
                        Console.WriteLine("That ID of country does not exits!");
                    }
                }
                else
                {
                    Console.WriteLine("That ID does not exits!");
                }

                Console.WriteLine("Press any key to continue...");
                Console.ReadLine();

                break;

            default:
                Console.WriteLine("That options does not exits!");
                break;
            }
        }