encoded url

Hello,
I want to increase the security in my project. I know that I should encode the URLs but I can't open any encoded URL, and how can I get the parameters from an encoded URL through querystring. The url can be decoded and return back as it was, but this is not useful to me???? I am in need for an explanation about this issue from an expert.......Please a help!!!!

your question is confusing.

are you talking about ASP.NET ?
why would you need to encrypt a URL? if you want to pass data you should use forms and an SSL certificate