using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Bad Example: ");

        try

        {

            ThrowBad();

        }

        catch(Exception ex)

        {

            Console.WriteLine(ex.StackTrace);

        }

        Console.WriteLine();

        Console.WriteLine("Good Example: ");

        try

        {

            ThrowGood();

        }

        catch(Exception ex)

        {

            Console.WriteLine(ex.StackTrace);

        }

    }

    private static void ThrowBad()

    {

        try

        {

            Throw();

        }

        catch (Exception ex)

        {

            throw ex;  // Incorrect!

        }

    }

    private static void ThrowGood()

    {

        try

        {

            Throw();

        }

        catch

        {

            throw;  // Correct!

        }

    }

    private static void Throw()

    {

            throw new InvalidOperationException();

    }

}