2.8

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

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            string sPassword = "12345";
            string sSecretMessage = "Секретное сообщение: ******** ********** ***************** *** *******.";
            string sUserEnter = "";
            int iCounter = 5;
            int iPasswordPosition = 16;
            string s = "";
            Console.Title = "2.8 Пароль";
            string sMessage = "Введите пароль: ";

            while (iCounter > 0 && sUserEnter != sPassword)
            {
                Console.Write(sMessage);

                while (true)
                {
                    ConsoleKeyInfo c = Console.ReadKey();
                    if (c.Key == ConsoleKey.Enter)
                        break;
                    s += c.KeyChar;
                    Console.SetCursorPosition(iPasswordPosition, 0);
                    foreach (char ch in s)
                        Console.Write('*');
                }

                sUserEnter = s;
                s = "";
                sMessage = $"Введите пароль (осталось попыток {--iCounter}): ";
                iPasswordPosition = 37;
                Console.Clear();
            }

            if (sUserEnter != sPassword)
            {
                sSecretMessage = "Пароль неверен";
            }

            Console.WriteLine(sSecretMessage);
            Console.ReadKey();
        }
    }
}