>Why not just test for the presence of the innerexception != null and if it isn't set the errormessage to that text.
>
>

>   var msg = "";
>   if(string.IsNotNull(ex.InnerException))
>   {
>        msg = ex.InnerException;
>        throw new DuplicatePropertyException(msg);
>   }
>
>

This is not what I am asking. I am asking specifically about

throw ex

part.

In the throw ex is there a way to append that inner exception? E.g. what should I throw?