some my web pages work with variables stored in QueryString,
people i know that this next sounds stupid, but maybe anyone can give me some good advices about QueryString variables Security

i mean that, each user can change variables vaalues stored in InternetBrowser address bar, it is possible to protect users from changing that variables, or for example it is possible to detect, - if user has changed querystring variables or my script ???

thanks

No.. use cookies or sessions if you need a greater level of security when carrying values from page to page.

Or Request.Form