>I can't find any info on what might happen in the pipeline between the occurrence of the default validation and the custom validation. I'd guess 'not a lot' but that's not much help :-}
>In fact, I'm still mystified as to why we are both seeing this behaviour when everything a read leads me to expect the opposite order of events........
>
>I see Rick Strahl blogged about it (but doesn't mention the role of custom validators):
>http://www.west-wind.com/weblog/posts/2010/Aug/19/RequestValidation-Changes-in-ASPNET-40

Thanks