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In the below sample, we have used custom validation to validate the textbox. If you check the checkbox, then textbox value should be required. So, the error class added to the component also validation message appears. But if you uncheck the checkbox, then textbox value should not be required. So, success class should be added to the component and validation message disappears from the control. Here validation message disappears but error class not removed from the control.
Sample link: