recommend a library/API to unzip file in C# [closed]

Answer 1

In the past, I've used DotNetZip (MS-PL), SharpZipLib (GPL), and the 7ZIP SDK for C# (public domain). They all work great, and are open source.

I would choose DotNetZip in this situation, and here's some sample code from the C# Examples page:

using (ZipFile zip = ZipFile.Read(ExistingZipFile))
{
  foreach (ZipEntry e in zip)
  {
    e.Extract(TargetDirectory);
  }
}