Unzip folder keeping folder structure

Hey guys,

I'm trying to unzip an application, but every method I've tried either doesn't keep the folder structure, or doesn't unzip all the files.
I've tried using SharpZipLib.dll, Ionic.dll, zipUnzip.dll, and one other, but I forgot it's name.

I should point out that SharpZipLib didn't have any of the issues I mentioned above; instead it put my project directory in front of the input and output directories. I don't understand why...

Anyway, I'm hoping somebody can suggest another library to try, or give me some tips on using one of the libraries I mentioned above.

Thanks for your time! - Gibson