ASP.NET handling viewstate and controls

[motil]

I've read somewhere that you can use JSON to be more secure, i think it was something with serialize it.. but yea i understand, no matter the method you use once you use js users can call your methods and even modified its variables, you can even do so through any browser address bar.
in addition to that, every single information you send and receive with ajax can easily be read by others(Firefox's FireBug anyone?)

thank you very much for pointing the security issue i will now be much more careful and will put much more thought when using ajax.