How To... > Create a New Error Messaging Control

Often a convenient and useful way of validation feedback is to display an error message in some control e.g. label, list box (which can serve as validation log), status bar etc. This way of error indication is supported by TNGControlErrorProvider which references such a control with its ErrMsgControl property. The error messaging control has to support INGValidatingMsgControl interface.

INGValidatedControl interface methods:

Name	Parameters	Result type	Description
SetErrorMessage	Val : string; ErrorLevel: Integer	none	If ErrorLevel is non-zero should display (or append) the error message val; otherwise should clear the error message.
GetLastErrorMessage	none	string	Should return the most recent (currently visible) error message.

See provided with the package example validation aware controls for examples of implementing validated controls.