I like to zip multiple files which are being created dynamically in my web application. Those files should be zipped. For this, i dont want to use any third-party tools. jus
I'm not sure what you mean by not wanting to use thrid party tools, but I assume its that you don't want some nasty interop to programmatically do it through another piece of software.
I recommend using ICSharpCode SharpZipLib
This can be added to your project as a reference DLL and is fairly straightforward for creating ZIP files and reading them.