class Log
    {
        private static StreamWriter _fileOut;
        static Boolean LogToConsole = true;
        static Boolean LogToFile = true;

        static Log()
        {
            if (LogToFile)
            {
                _fileOut = File.CreateText("Program_out.txt");
                _fileOut.AutoFlush = true;
            }
        }

        public static void WriteLine(string format, params object[] arg)
        {
            if (LogToConsole)
                Console.WriteLine(format, arg);
            if (LogToFile)
                _fileOut.WriteLine(format, arg);
        }
    }