using System.Configuration;
class Program {
   static void Main() {
      SavePwd("MyPassword");
      System.Console.WriteLine(LoadPwd());
   }
   static void SavePwd(string pwd) {
      Configuration cfg = ConfigurationManager.OpenExeConfiguration(
                             ConfigurationUserLevel.None );
      cfg.AppSettings.Settings.Add( "TagPassword", pwd );
      cfg.AppSettings.SectionInformation.ProtectSection(
                             "RsaProtectedConfigurationProvider" );
      cfg.Save();
   }
   static string LoadPwd() {
      Configuration cfg = ConfigurationManager.OpenExeConfiguration(
                             ConfigurationUserLevel.None );
      return cfg.AppSettings.Settings["TagPassword"].Value;
   }
}