The Grid component has exceptionally strong data validation features. This video demonstrates the validation features available, including Data validation rules, Data validation using custom Xbasic at the field level, Data validation events, and automatically honoring Field Rules for DBF tables.
These video discuss the various validation options in the UX Component.
The videos below discuss the validation features of Alpha Anywhere. While these videos were recorded for the UX Component, the discussions about Validation rules, Validation Xbasic, and Immediate Validation apply to the Grid Component.