I feel bad for asking this when there are so many questions that are related but I was not able to find/understand the answer I am looking for.

// 2. Develop a program to convert currency X to currency Y and visa versa. using System;

class Problem2
{
    static void Main (string[] args)
    {
        while (true) {
            Console.WriteLine ("1. Currency Conversion from CAD to Won");
            Console.WriteLine ("2. Currency Conversion from Won to Cad");
            Console.Write ("Choose from the Following: (1 or 2)? ");
            int option = int.Parse( Console.ReadLine() );
            //double x;
            if (option == 1) {
                Console.WriteLine ("Type in the amount you would like to Convert CAD to Won: ");
                //double y =double.Parse( Console.ReadLine());
                //Console.WriteLine( cadToWon( y ) );
                Console.WriteLine( cadToWon( double.Parse( Console.ReadLine() ) ));
            }
            if (option == 2) {
                Console.WriteLine ("Type in the amount you would like to Convert Won to CAD: ");
                Console.WriteLine( wonToCad (double.Parse( Console.ReadLine())));
            }
        }
    }

    double cadToWon( double x )
    {
        return x * 1113.26;
    }

    double wonToCad( double x)
    {
        return x / 1113.26;
    }
}

This give me the Error messgae "An object reference is required for the non-static field, method, or property 'Problem2..." I know that I'll be able to run the program if I add static infront of the methods but I'm wondering why I need it (I think it's because Main is static?) and what do I need to change in order to use these methods without adding static to them?

Thank you