Ajax toolkit validations are server side or client side?

Question

I have one simple question (doubt).
Ajax is a server side technology so it hits the server asynchronously but when we use ajax toolkit's text-box validations then even if internet is disconnected , text-box gets validated how?? is it client side?

Answer 1

Actually, AjaxToolkit generates javascript codes in pages. all validations are done in Client side.

Answer 2

The AJAXToolkit is basically a helper that implements some client-side functionality for you. The user story in WebForms is all about rapid application development. The entire WebForms infrastructure is in place in order to wrap server-side + client-side functionality in a way that allows you to create web applications like you would WinForms applications. WebForms was developed by Microsoft to allow WinForms developers to use the same techniques when developing for the web.

That being said, all asp.net validators are both client-side and server-side. Doing client-side validation without server-side validation is pointless. Client-side validation (AJAX or not) is only used to give users a more responsive UI and maybe save some server round-trips for input that can be easily detected as invalid. The true validation is done server-side when the form is POST ed. If there were only client-side validation in place, a user with malicious intent could just circumvent the validation by posting the form from a tool like Fiddler . Also, what about clients which do not support JavaScript at all? (Rare as they might be these days...)