C#_2_lesson_console_menu

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace C_Ijun
{
    internal class Program
    {
        static void Main(string[] args)
        {
            const string CommandClearWindow = "ClearWindow";
            const string CommandTimeInfo = "Today is...";
            const string CommandChangeColorText = "ChangeColorConsoleText";
            const string CommandChangeColorBckg = "ChangeColorConsoleBackground";
            const string CommandExit = "Exit";

            bool isWork = true;
            string userChoice;

            while (isWork)
            {
                Console.WriteLine("Консольное меню.");
                Console.WriteLine("Выбрать действие:");
                Console.WriteLine($"{CommandClearWindow} - Очистить экран.");
                Console.WriteLine($"{CommandTimeInfo} - Вывести день недели.");
                Console.WriteLine($"{CommandChangeColorText} - Изменить расветку текста консоли.");
                Console.WriteLine($"{CommandChangeColorBckg} - Изменить расветку фона консоли.");
                Console.WriteLine($"{CommandExit} - Выход.");

                userChoice = Console.ReadLine();

                switch (userChoice)
                {
                    case CommandClearWindow:
                        Console.Clear();
                        break;

                    case CommandTimeInfo:
                        Console.WriteLine(DateTime.Now);
                        break;

                    case CommandChangeColorText:
                        if (Console.ForegroundColor == ConsoleColor.Blue)
                        {
                            Console.ForegroundColor = ConsoleColor.Black;
                        }
                        else
                        {
                            Console.ForegroundColor = ConsoleColor.Blue;
                        }
                        break;

                    case CommandChangeColorBckg:
                        Console.Clear();

                        if (Console.BackgroundColor == ConsoleColor.Blue)
                        {
                            Console.BackgroundColor = ConsoleColor.White;
                        }
                        else
                        {
                            Console.BackgroundColor = ConsoleColor.Blue;
                        }
                        break;

                    case CommandExit:
                        Console.WriteLine("Это конец...");
                        isWork = false;
                        break;
                }
            }
        }
    }
}