Form Textbox that only Accepts Text (no numbers)

Hi,

I have a form with a number of text boxes. One of which I want to only accept numbers and another I want to only accept text characters (no numbers so only the alphabet). I've been able to restrict one to numbers but I can't get the text only one to work. The coding I use for the numbers-only textbox is below (taken from another thread for TextBoxQuant) and all the attempts I've done for my other textbox (TextBoxUnit) are rubbish.

Any help appreciated.

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Thanks

Perfect!

I tried variations on that but my syntax obviously left much to be desired.

Thanks for the speedy help.