Hey,

i have made a program thats like a calculator, you type numbers into a text box and it does calculations. But the problem is you can still type letters into this text box, which confuses it.
i was wondering how you could make it so you can only enter numbers between 0-9 in the text box, and possibly make a pop say 'please enter number between 0-9' if you do press a letter.

thankyou