I have a UserForm with multiple Text Boxes and a "Run" command button. The Text Box values can only be integers. I would prefer to check for non-integer values as they are being typed as opposed to validating them in the "Run" button's "click" handler.

To this end, I've setup "Change" event handlers for the Text Boxes that do the validation and display a MsgBox for illegal entries. Although this works as desired, the user is under no obligation to fix the entry- leaving it unchanged will not trigger a "Change" event. As a result, the "run" button could try to process bad data and an unhandled exception might occur.

I suppose I could just disable the "Run" button if any Text Box contains uncorrected bad data but I'm thinking there is a better design. Any suggestions will be welcome.

Thanks in advance.

-mike