.net - How to use .dll class files in visual studio? -

i have download folder of .dll files codeplex.com add , use class in project don't know how use them.it zip files c# , here link: http://dotnetzip.codeplex.com/

thanks!

add reference dll , try sample code:

 using (zipfile zip = new zipfile())  {      // add map file "images" directory in zip archive      zip.addfile("c:\\images\\personal\\7440-n49th.png", "images");      // add report different directory in archive      zip.addfile("c:\\reports\\2008-regional-sales-report.pdf", "files");      zip.addfile("readme.txt");      zip.save("myzipfile.zip");  }