SharpZipLib Download
http://www.icsharpcode.net/opensource/sharpziplib/Download.aspx
C#打包文件夹成zip格式（包括文件夹和子文件夹下的所有文件）
http://www.cnblogs.com/leco/archive/2010/11/18/1881301.html
DotNetZip - Zip and Unzip in C#, VB, any .NET language
http://dotnetzip.codeplex.com/
Creating Zip archives in .NET (without an external library like SharpZipLib)
http://weblogs.asp.net/jgalloway/archive/2007/10/25/creating-zip-archives-in-net-without-an-external-library-like-sharpziplib.aspx