namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            WeekClass myInnerClass = new WeekClass() { weekDay="Monday"};
            WeekClass myInnerClass2 = new WeekClass() { weekDay="Monday"};

            setTuesday(myInnerClass);
            setTuesday(myInnerClass2.weekDay);

            Console.WriteLine(myInnerClass);  //Output: ???
            Console.WriteLine(myInnerClass2);  //Output: ???
            Console.ReadLine();
        }

        public static void  setTuesday(WeekClass weekClass)
        {
            weekClass.weekDay = "Tuesday";
        }

        public static void setTuesday(string weekDay)
        {
            weekDay = "Tuesday";
        }

        public class WeekClass
        {
            public string weekDay;

            public override string ToString()
            {
                return weekDay.ToString();
            }
        }
    }
}