Generating zip file using c# code

Have you looked into SharpZipLib?

With .NET 4.5 you can now create zip files really easily using the .NET framework:

using System;
using System.IO;
using System.IO.Compression;

namespace ConsoleApplication
{
  class Program
  {
    static void Main(string[] args)
    {
      string startPath = @"c:\example\start";
      string zipPath = @"c:\example\result.zip";
      string extractPath = @"c:\example\extract";

      ZipFile.CreateFromDirectory(startPath, zipPath);

      ZipFile.ExtractToDirectory(zipPath, extractPath);
    }
  }
}

The above code taken directly from Microsoft's documentation: http://msdn.microsoft.com/en-us/library/ms404280(v=vs.110).aspx

There are other ways of generating compressed files that are further explained on the page linked to above.

One third party library I've used is http://dotnetzip.codeplex.com/

I like it a lot more than SharpZipLib -- SharpZipLib isn't really very intuitively layed out at all.

Use external library like this one or this one. For example with DotNetZip you can make a zip file like this:

 using (ZipFile zip = new ZipFile())
 {
     // add this map file into the "images" directory in the zip archive
     zip.AddFile("c:\\images\\personal\\7440-N49th.png", "images");
     // add the report into a different directory in the archive
     zip.AddFile("c:\\Reports\\2008-Regional-Sales-Report.pdf", "files");
     zip.AddFile("ReadMe.txt");
     zip.Save("MyZipFile.zip");
 }