Posted 12 May 2022, 6:03 am ESTOut UI controls are version 4.0.20191.359 (as shown in winforms solution references).
The textbox in question has MaxLength set to 11.
We have a handler for the Validated event.
In the Validated event, we insert some extra formatting characters into the string before assigning the string into the textbox Value property.
The Value allows a string length greater than the MaxLength of the control.
Shouldn't the textbox disallow that?