Canceling TextBox input on validation error in WPF?

After a lot of research it seems that the only way to have full control over the input to a TextBox is to handle several events directly. According to WPF Recipes in C# 2008 (1st ed. , p.

169).

You've probably seen this already, but it's the simplest solution and has always worked for me. I catch the PreviewKeyDown event and..

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