PowerTCP Zip Compression for .NET Tool
A .NET Zip library that provides the flexibility, security, performance, and support desired for efficiently integrating zip compression and encryption into your development projects. Includes many C# and VB code examples and samples. Here are some features not found in the .NET Framework.

Flexibility and Ease-of-Use
WinZip, PKZIP, and UNIX gZip compatible
Three levels of compression/performance control
Large file (over 4 GB) support
QuickZip and QuickUnzip short-cut methods
Unicode filename support for international character sets
64-bit OS support
Integrates with Visual Studio 2005, 2008, 2010
High Performance
High-performance compression engine
Optimized "on the fly" streaming compression and inflation, without buffering to disk or memory
Add files without re-compressing the entire archive
Multi-threaded asynchronous functionality
Fully developed in managed C#

Comprehensive Security
WinZip compatible security
Standard zip encryption support
AES encryption - 128-bit, 192-bit and 256-bit options
"On the fly" encryption and decryption

Highlighted Features
Wildcard support for batch operations
Recursive directory tree support
Stream support as compression/inflation data sources or destinations
Span to multiple disks and split to multiple files on the same disk
Self-extracting executables
Integrates with Visual Studio 2005, 2008, 2010, 2012
NET Framework 4 Client Profile compatible
Many sample projects for both C# and VB.NET, as well as ASP.NET included