title: Free compression library for C# which supports 7zip (LZMA)
body: <p>I have a program (written in C#) that reads/writes its data directly (direct file access without server) to firebird database files. For a better exchange I want to (un)compress them on import/export for a better exchange over the internet without the need of an external program to (un)compress them.</p>
  
  <p>I know <a href="http://www.sharpdevelop.com/OpenSource/SharpZipLib/Default.aspx" rel="noreferrer">#ziplib</a> which supports Zip, GZip, Tar and BZip2.</p>
  
  <p>What else free compression libraries for C# do you know?
  Is there a .NET library which supports LZMA so i can read/write ".7z" files?</p>