Issue with ItemDeleting event receivers

When working with event receivers you can use custom error pages. For example and implementation tips you can look here: http://www.zimmergren.net/technical/sp-2010-how-to-event-receivers-and-custom-error-pages

This doesn't work for ItemDeleting event receivers.

Illustration

The following piece of code:

will produce the following result:

We don't see the custom error page as we should as per the article above.

Semi-solution

We can use just custom message, not the custom page in case of ItemDeleting.

Code:

Result:

Enjoy.

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