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

[Bruce]

Sorry Hasan but its about the 100th time I have answered questions like 
that.

It makes as much sense as me asking:

In Haskell I do this -

Code
   blah blah
End

How do I do this in APL?


See what I mean?  We, on this mailing list, generally don't know nor 
care how to write Visual Basic code.