using System;

public static class TemperatureConverter

{

    public static double CelsiusToFahrenheit(string temperatureCelsius)

    {

        // Convert argument to double for calculations.

        double celsius = Double.Parse(temperatureCelsius);

​

        // Convert Celsius to Fahrenheit.

        double fahrenheit = (celsius * 9 / 5) + 32;

​

        return fahrenheit;

    }

​

    public static double FahrenheitToCelsius(string temperatureFahrenheit)

    {

        // Convert argument to double for calculations.

        double fahrenheit = Double.Parse(temperatureFahrenheit);

​

        // Convert Fahrenheit to Celsius.

        double celsius = (fahrenheit - 32) * 5 / 9;

​

        return celsius;

    }

}

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please select the convertor direction");

        Console.WriteLine("1. From Celsius to Fahrenheit.");

        Console.WriteLine("2. From Fahrenheit to Celsius.");

        Console.Write(":");

​

        string selection = Console.ReadLine();

        double F, C = 0;

​

        switch (selection)

        {

            case "1":

                Console.Write("Please enter the Celsius temperature: ");

                F = TemperatureConverter.CelsiusToFahrenheit(Console.ReadLine());

                Console.WriteLine("Temperature in Fahrenheit: {0:F2}", F);

                break;

​

            case "2":

                Console.Write("Please enter the Fahrenheit temperature: ");

                C = TemperatureConverter.FahrenheitToCelsius(Console.ReadLine());

                Console.WriteLine("Temperature in Celsius: {0:F2}", C);

                break;

​

            default:

                Console.WriteLine("Please select a convertor.");

                break;

        }

​

        // Keep the console window open in debug mode.

        Console.WriteLine("Press any key to exit.");

        Console.ReadKey();

    }

}