Thanks for your inquiry.
One of query string main disadvantages is passing info in plain text from page to page and as a result, query strings are not meant to pass sensitive information, such as credit card numbers, throughout an application. If you want to pass secure information, you'd be better off using session state and caching information on the database, since this would be the most secure. Sitefinity can cache data on the database
as this article discusses and more info on implementing session state can be found reading this article
Sitefinity does not have a specific class that handles query strings, but you could easily drop a RadGrid with a hyperlink that passes a query string
if you'd like. If this does not fit your needs, can you send us the code for your class that encrypts query strings?
Feel free to contact us if you need further assistance.
the Telerik team
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