exit control

class Program
{
    static void Main(string[] args)
    {
        const string ExitCommand = "exit";
        bool isWorking = true;
        string userInput;

        Console.WriteLine($"Введите {ExitCommand} для выхода из программы.");

        while (isWorking)
        {
            userInput = Console.ReadLine();

            if (userInput == ExitCommand)
            {
                isWorking = false;
            }
        }
    }
}