Use Silverlight to open, extract, create and add entries to your zip files. 

Supports opening, extracting, creating and adding entries to Zip files within Silverlight, and have your Zip files be compatible with other Zip utilities.
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Supports the widely compatible Deflate compression method, which can be tuned to optimize compression ratio or compression time.
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Supports the widely compatible Deflate compression method, which can be tuned to optimize compression ratio or compression time. 
Add or extract single entries on-the-fly using Streams from a single Zip file containing multiple assets, and that takes up less space. 

Add or extract single entries on-the-fly using Streams from a single Zip file containing multiple assets, and that takes up less space.
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Add and extract password protected file entries in Zip files.
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Add and extract password protected file entries in Zip files. 
You can easily obtain the directories of Zip files, including file names, sizes and timestamps. 

You can easily obtain the directories of Zip files, including file names, sizes and timestamps.
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Managed Zlib

The compiled assembly is built on a managed implementation of Zlib, so you can use Zlib compression, too.

The compiled assembly is built on a managed implementation of Zlib, so you can use Zlib compression, too.