PasswordHelper.cs

using System;
namespace MoheMohe
{
    public class PasswordHelper
    {
        public static string ReadFromStdIn()
        {
            var password = new System.Text.StringBuilder();
            new Action(() =>
            {
                while (true)
                {
                    var input = Console.ReadKey(true);

                    switch (input.Key)
                    {
                        case ConsoleKey.Enter:
                            return;

                        case ConsoleKey.Backspace:
                            var deleteConsole = false;
                            if (password.Length > 1)
                            {
                                password.Remove(password.Length - 2, 1);
                                deleteConsole = true;
                            }
                            else if (password.Length == 1)
                            {
                                password.Clear();
                                deleteConsole = true;
                            }

                            if (deleteConsole)
                            {
                                Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop);
                                Console.Write(" ");
                                Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop);
                            }
                            break;
                        
                        default:
                            password.Append(input.KeyChar);
                            Console.Write("*");
                            break;
                    }
                }
            })();

            return password.ToString();
        }
    }
}