Can you elaborate a bit on "by using some classes"? When you build an ASP.NET application with Visual Studio you will typically always have classes that drive the pages and those classes are compiled into a DLL and therefore not visible when you deploy it.
What exactly is your intended goal when you say "so that others cant [sic] view the details"? Do you mean you *don't* want or *do* want other to see the details? What details are you referring to? Do you mean you do or don't want others to see the HTML or the code-behind for the pages?
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Peter