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copied!<p>If you are manipulating ZIP files, you may want to look into a 3rd-party library to help you.</p> <p>For example, DotNetZip, which has been recently updated. The current version is now v1.8. Here's an example to create a zip:</p> <pre><code>using (ZipFile zip = new ZipFile()) { zip.AddFile("c:\\photos\\personal\\7440-N49th.png"); zip.AddFile("c:\\Desktop\\2005_Annual_Report.pdf"); zip.AddFile("ReadMe.txt"); zip.Save("Archive.zip"); } </code></pre> <p>Here's an example to <em>update</em> an existing zip; you don't need to extract the files to do it:</p> <pre><code>using (ZipFile zip = ZipFile.Read("ExistingArchive.zip")) { // 1. remove an entry, given the name zip.RemoveEntry("README.txt"); // 2. Update an existing entry, with content from the filesystem zip.UpdateItem("Portfolio.doc"); // 3. modify the filename of an existing entry // (rename it and move it to a sub directory) ZipEntry e = zip["Table1.jpg"]; e.FileName = "images/Figure1.jpg"; // 4. insert or modify the comment on the zip archive zip.Comment = "This zip archive was updated " + System.DateTime.ToString("G"); // 5. finally, save the modified archive zip.Save(); } </code></pre> <p>here's an example that extracts entries:</p> <pre><code>using (ZipFile zip = ZipFile.Read("ExistingZipFile.zip")) { foreach (ZipEntry e in zip) { e.Extract(TargetDirectory, true); // true => overwrite existing files } } </code></pre> <p>DotNetZip supports multi-byte chars in filenames, Zip encryption, AES encryption, streams, Unicode, self-extracting archives. Also does ZIP64, for file lengths greater than 0xFFFFFFFF, or for archives with more than 65535 entries.</p> <p>free. open source</p> <p>get it at <a href="https://archive.codeplex.com/?p=dotnetzip" rel="nofollow noreferrer">codeplex</a> or <a href="https://codeplexarchive.blob.core.windows.net/archive/projects/DotNetZip/DotNetZip.zip" rel="nofollow noreferrer">direct download from windows.net</a> - CodePlex has been discontinued and archived</p>

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