[Asp.Net] zip and unzip in asp.net using DotNetZip Library

If you want to create a zip in your asp.net.I suggests that you can use DotNetZip Libriay that is very easy to use.You can get more details in the following link :
DotNetZip Library


Create a downloadable zip within ASP.NET. This example creates a zip dynamically within an ASP.NET postback method, then downloads that zipfile to the requesting browser through Response.OutputStream. No zip archive is ever created on disk.

public void btnGo_Click (Object sender, EventArgs e)
{
  Response.Clear();
  Response.BufferOutput= false;  // for large files
  String ReadmeText= "This is a zip file dynamically generated at " + System.DateTime.Now.ToString("G");
  string filename = System.IO.Path.GetFileName(ListOfFiles.SelectedItem.Text) + ".zip";
  Response.ContentType = "application/zip";
  Response.AddHeader("content-disposition", "filename=" + filename);
  
  using (ZipFile zip = new ZipFile()) 
  {
    zip.AddFile(ListOfFiles.SelectedItem.Text, "files");
    zip.AddEntry("Readme.txt", "", ReadmeText);
    zip.Save(Response.OutputStream);
  }
  Response.Close();
}