Hi Rob,

I've taken a slightly different approach to this that also works quite well. Basically, the business object has a protected cErrorMessage property and SetErrorMessage and GetErrorMessage methods. When a method fails, like save, the calling object calls the business object's GetErrorMessage method, which just returns the error message as a string. GetErrorMessage basically stores cErrorMessage to a variable, clears the property and returns the variable. SetErrorMessage accepts a string, which is added to the existing error message, which is nice in case multiple business rules were violated. It's actually a little more complicated than this because GetErrorMessage actually polls member objects for errors as well, but you get the idea.