personal accounting

namespace personal_accounting
{
    internal class Program
    {
        static void Main(string[] args)
        {
            const string AddNewDossierCommand = "add dossier";
            const string OutputDossierCommand = "output all dossier";
            const string FindLastNameCommand = "find";
            const string DeleteDossierCommand = "delete";
            const string ExitCommand = "exit";

            bool isWorking = true;
            string[] fullNames = new string[0];
            string[] jobTitles = new string[0];

            while (isWorking)
            {
                Console.WriteLine($"База данных:" +
            $"\nДля добавления досье введите - {AddNewDossierCommand}." +
            $"\nДля вывода всей базы введите - {OutputDossierCommand}." +
            $"\nДля удаления досье введите - {DeleteDossierCommand}." +
            $"\nДля поиска по фамилии введите - {FindLastNameCommand}." +
            $"\nДля выхода введите - {ExitCommand}.");

                string? userInput = Console.ReadLine();

                switch (userInput)
                {
                    case AddNewDossierCommand:
                        AddDossier(ref fullNames, ref jobTitles);
                        break;

                    case OutputDossierCommand:
                        OutputAllDossier(fullNames, jobTitles);
                        break;

                    case DeleteDossierCommand:
                        DeleteDossier(ref fullNames, ref jobTitles);
                        break;

                    case FindLastNameCommand:
                        FindLastName(fullNames, jobTitles);
                        break;

                    case ExitCommand:
                        isWorking = false;
                        break;

                    default:
                        DisplayUncorrectMessage();
                        break;
                }

                Console.Clear();
            }
        }

        static string[] AddData(string[] array, string data)
        {
            string[] tempArray = new string[array.Length + 1];

            for (int i = 0; i < array.Length; i++)
            {
                tempArray[i] = array[i];
            }

            Console.Write($"Введите {data}: ");
            string? name = Console.ReadLine();
            tempArray[array.Length] = name;
            array = tempArray;
            return array;
        }

        static void AddDossier(ref string[] fullNames, ref string[] jobTitles)
        {
            string fullName = "ФИО";
            string jobTitle = "должность";

            fullNames = AddData(fullNames, fullName);
            jobTitles = AddData(jobTitles, jobTitle);
        }

        static void OutputAllDossier(string[] fullNames, string[] jobTitles)
        {
            if (fullNames.Length == 0)
            {
                Console.WriteLine("Массив пуст.");
                Console.ReadKey();
            }
            else
            {
                for (int i = 0; i < fullNames.Length - 1; i++)
                {
                    int serialNumber = i + 1;

                    Console.Write($"{serialNumber} {fullNames[i]} {jobTitles[i]} - ");
                }

                Console.Write($"{fullNames.Length} {fullNames[fullNames.Length - 1]} {jobTitles[jobTitles.Length - 1]}.");

                Console.ReadKey();
            }
        }

        static string[] DeleteData(string[] array, int index)
        {
            string[] tempArray = new string[array.Length - 1];

            for (int i = 0; i < index; i++)
            {
                tempArray[i] = array[i];
            }

            for (int i = index + 1; i < array.Length; i++)
            {
                tempArray[i - 1] = array[i];
            }

            array = tempArray;
            return array;
        }

        static int TryGetNumber()
        {
            bool isWorking = true;
            int number = 0;

            bool isNumber = int.TryParse(Console.ReadLine(), out int result);

            if (isNumber)
            {
                number = result - 1;
                isWorking = false;
            }
            else
            {
                Console.WriteLine("Необходимо ввести число.");
                Console.ReadKey();
            }

            return number;
        }

        static void DeleteDossier(ref string[] fullNames, ref string[] jobTitles)
        {
            Console.Write("Введите номер досье, которое хотите удалить: ");

            int number = TryGetNumber();

            if (number > fullNames.Length || number < 0)
            {
                Console.WriteLine("Число вышло за пределы массива.");
                Console.ReadKey();
            }
            else if (fullNames.Length == 0)
            {
                Console.WriteLine("Массив пуст.");
                Console.ReadKey();
            }
            else
            {
                fullNames = DeleteData(fullNames, number);
                jobTitles = DeleteData(jobTitles, number);
            }
        }

        static void FindLastName(string[] fullNames, string[] jobTitles)
        {
            if (fullNames.Length == 0)
            {
                Console.WriteLine("Массив пуст.");
                Console.ReadKey();
                return;
            }

            Console.Write("Введите фамилию: ");
            string? lastName = Console.ReadLine();

            for (int i = 0; i < fullNames.Length; i++)
            {
                int serialNumber = i + 1;

                if (fullNames[i].Split()[0] == lastName)
                {
                    Console.WriteLine($"{serialNumber} {fullNames[i]} {jobTitles[i]}");
                    Console.ReadKey();
                    return;
                }
            }

            Console.WriteLine($"Досье с фамилией {lastName} не найдено.");
            Console.ReadKey();
        }

        static void DisplayUncorrectMessage()
        {
            Console.WriteLine("Введена некорректная команда. Попробуйте еще раз.");
            Console.ReadKey();
        }
    }
}