using System;

public class Program

{

    public static void Main()

    {

        try

        {

            ThrowInvalidTypeException();    

        }

        catch(ValidationException ex)

        {

            Console.WriteLine(ex.GetType().Name);   

        }

        try

        {

            ThrowInvalidTypeException();    

        }

        catch(InvalidTypeException ex)

        {

            Console.WriteLine(ex.GetType().Name);   

        }

        // Blows up here because Exception isn't a subclass of InvalidTypeException

        try

        {

            ThrowException();   

        }

        catch(ValidationException ex)

        {

            Console.WriteLine(ex.GetType().Name);   

        }

    }

    public static void ThrowException()

    {

        throw new Exception();  

    }

    public static void ThrowInvalidTypeException()

    {

        throw new InvalidTypeException();   

    }

}

​

public class ValidationException : Exception

{

}

​

public class InvalidTypeException: ValidationException

{

}