How to compress and decompress folder

[minhchieu]

Hi all,
I'm a new with SharpZipLib. I want to zip a folder which has some files and subfolders, and unzip it to a new folder with the same structure. Now i can zip the folder. This is my code.
// Zip up the files
string[] filenames = Directory.GetFiles("C:/Down");
using (ZipOutputStream s = new ZipOutputStream(File.Create("C:/ZipFile/down.zip")))
{
s.SetLevel(9);
byte[] buffer = new byte[4096];
foreach (string file in filenames)
{
ZipEntry entry = new ZipEntry(Path.GetFileName(file));
entry.DateTime = DateTime.Now;
s.PutNextEntry(entry);
using (FileStream fs = File.OpenRead(file))
{
int sourceBytes;
do
{
sourceBytes = fs.Read(buffer, 0, buffer.Length);
s.Write(buffer, 0, sourceBytes);
}
while (sourceBytes > 0);
}
}
s.Finish();
s.Close();
But I can not decompress the zip file.
Could some one help me? Thanks in advance.
Minh Chieu