Welcome to my blog! Although I'm too late in starting this, and there is no hope for me to update it with an acceptable frequency, at least in the near future, I count on this as a way to interface with you!
Hope I can help you )
I used your numberic text box handler code and it worked out well. I moved the KeyPress event handler into the NumericTextBoxHandler class so the class now takes care of both the paste and the input checks.
Thanks John, for your positive feedback. If you think the changes you've made to the code make it work better, please don't hesitate to send them to me, so I implement them inside the code (crediting you in the article for sure.)