Can we Add one more property in TextBox

Hi,

I have textbox and spread every where in my Application,

but would like to add one more property which set for numeric textbox and i can avoid to enter character.

or can you suggest me to make less change and make this kind of workable.

I can use Texbox_keydown and then e.handle but i dont want to add this event for each textbox like that.

pls suggest some thing better.

Thanks

A-

Ashok