Interview_Question on Custom Exception in C#

Question

I faced a question on Custom Exceptions in an Interview. As below there are four multiple catches which catch each custom exception. Interviewer asked me to write a pseudo code for catch blocks how i can handle all four custom exceptions.

I answered as

        try 
        {   try 
            {
                try { }
                catch (DEx dEx) { Console.WriteLine(dEx.Message); }
            }
            catch (BEx bEx) { Console.WriteLine(bEx.Message); }
            catch (CEx cEx) { Console.WriteLine(cEx.Message); }
        }
        catch (AEx aEx) { Console.WriteLine(aEx.Message); }  

Is it correct or wrong?

Answer 1

CEx and DEx inherits for BEx and BEx inherits from AEx. So exception hanlding should start from bottom to up. Base exception last.

try
    {
       // statements causing exception
    }
    catch( CEx cEx )
    {
       // error handling for CEx
    }
    catch( DEx dEx )
    {
       // error handling for DEx
    }
    catch( BEx bEx )
    {
       // error handling for BEx
    }
    catch( AEx aEx )
    {
       // error handling for AEx
    }
    finally
    {
       // statements to be executed
    }