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Do C# support zipping multiple files without using free third-party solutions. I knew there are some third-party solutions such as DotNet zip, SharpZipLib etc… did this, but I would like to create a one without using any of the above.
I see using J# (vjslib.dll) we can use GZip but J# is currently retired and not included in VS2010.
Can you point me to the correct place of this implementation?
There is always System.IO.Compression which features a class called GZipStream.
The ability to write real *.zip files will only be added in .NET 4.5 (see System.IO.Compression in 4.5).
So for now you can either try to write your own implementation (not recommended) or use a third-party component. Depending on the license of the component, you might be able to copy its code into your project (making patches to the component a bit cumbersome). The GPL for instance only requires you to release your source code when you distribute your derivative work. But in the case of a web application where no code or binary is actually given away, there are no consequences to using a GPL-ed library.