I wanted to let you know that you can "cheat" masked textbox. I created a masked textbox allowing hours, minutes and seconds in format: hh:mm:ss while "mm" and "ss" cannot be higher than 59 as it makes sense:
That works fine but if I enter f.e. "05:47:58" (what is fine and allowed by set rule), set the cursor behind the "05" (hours) and press DEL left key (as I want to delete the "5" the part right (mm:ss) shifts to left. You now see: 04:75:8_ Ooops! I can jump out of the textbox and nothing is complaining. The other way around (f.e. pasting something in between) is possible to. So the masked textbox does not guarantee the user can not override the rules.
Do you have any idea how I can make sure the masked textbox can not be overridden?