How to zip files in vs 2008

private string[] ExpandZipFile(string ZipFile, string DestFolder)  
    {  
      Shell h = new Shell();  
      Folder sf = h.NameSpace(ZipFile);  
      Folder df = h.NameSpace(DestFolder);  
      string[] files = new string[sf.Items().Count];  
      int i = 0;  
      foreach (FolderItem f in sf.Items())  
      {  
        df.CopyHere(f, 0);  
        files[i++] = f.Name;  
      }  
      return files;  
    }