[Gambas-user] IsVal()

[R. Stormo]

How to check a textbox for value?
Have tried if val(TextBox1.text)< 2000 then return 
but if the user for some reason insert numbers  and a char it do crash with
the "error wanted string got null instead."
I have not found a function like isVal().

Is there someway doing that check.?
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