using System;

public class Program

{

    public static void Main()

    {

        try {

            throw MakeMyException("oh no");

        } catch (MyException ex) {

          Console.WriteLine($"I caught MyException: {ex}");

        } catch (Exception ex) {

          Console.WriteLine("I shouldn't have caught this");

        }

​

    }

    public static Exception MakeMyException(string message) {

           return new MyException("oh no");

    }

}

​

public class MyException: Exception {

    public MyException(string message): base(message) {

    }

​

}

​

​