Create a ZIP file using ICSharpCode.SharpZipLib in SharePoint 2010 webpart

Problem :    

We have to generate a zip file in SharePoint  webpart from a no of files present in a Physical path

Example : 

Files :   ABC.pdf, DEF.pdf, GHI.pdf

Zip file : xyz.zip 

Solution :

I have found the solution on web to use ICSharpCode.SharpZipLib(Free)  and convert the number of files into a single zip file.

Download  ICSharpCode.SharpZipLib(Free) .

Below is the code i have attached.

Parameter for below function:

arrFilesToZip - ArrayList with all the Full file Path name which you want to zip

FolderName - Full path of the folder where you want to save your zip file

sZipFileName- Zip file name

public string CreateZipfile(ArrayList arrFilesToZip, string folderName, string sZipFileName)

        {

            try

            {

                using (ZipOutputStream s = new ZipOutputStream(File.Create(folderName + "\\" + sZipFileName + ".zip")))

                {

                    s.UseZip64 = UseZip64.Off;

                    //s.IsStreamOwner = false;

                    ICSharpCode.SharpZipLib.Checksums.Crc32 crc = new ICSharpCode.SharpZipLib.Checksums.Crc32();

                    foreach (string pathname in arrFilesToZip)

                    {

                        byte[] buffer = File.ReadAllBytes(pathname);

                        ZipEntry entry = new ZipEntry(Path.GetFileName(pathname));

                        entry.DateTime = DateTime.Now;

                        entry.Size = buffer.Length;

                        entry.CompressionMethod = CompressionMethod.Stored;

                        crc.Reset();

                        crc.Update(buffer);

                        entry.Crc = crc.Value;

                        s.PutNextEntry(entry);

                        s.Write(buffer, 0, buffer.Length);

                    }

                    s.Finish();

                    s.Flush();

                    s.Close();

                }

                return folderName + "\\" + sZipFileName + ".zip";

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

Please let me know if you have any issue in understanding of code. 

Appreciate of any suggestion.:)