Hello,
I would like to mention a request to build a complete app by which learner can learn the basic validations for almost all controls. Validation like, textbox should not be blank, dropdown should have selected a value, checkbox must have one checked mark etc. by showing cool warning/notifications to user. Between, if you can provide me documentation link for validation, I will try my own by reading and will learn more, if you builds a tutorial app for validation.
Thanks.