static void Main(string[] args)
        {
            #region Singleton

            UserState user = UserState.GetSingleton();
            user.LoginName = "imanizadeh.me";
            user.Age       = 28;


            UserState user2 = UserState.GetSingleton();
            Console.WriteLine(user2.LoginName);
            Console.WriteLine(user2.Age);
            Console.WriteLine(user == user2);

            #endregion



            Console.ReadKey();
        }