[Gambas-user] How to make Textbox only accept alphabetic and numbers characters

[KKing]

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We, on this mailing list, generally don't know nor care how to write 
Visual Basic code.
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I wonder if that is true. I personally don't see a problem with asking 
how to do something and then give an example in another well known 
language, you hopefully can find some friendly people who are happy to 
try and help.