Zip and unzip files using asp.net

Hi,
you can use this function

public void ExtractArchive(string zipFilename, string ExtractDir)
{
int Redo = 1;
ZipInputStream MyZipInputStream = default(ZipInputStream);
FileStream MyFileStream = default(FileStream);
MyZipInputStream = new ZipInputStream(new FileStream(zipFilename, FileMode.Open, FileAccess.Read));
ZipEntry MyZipEntry = MyZipInputStream.GetNextEntry();
Directory.CreateDirectory(ExtractDir);
while ((MyZipEntry != null))
{
if ((MyZipEntry.IsDirectory))
{
Directory.CreateDirectory(ExtractDir + "\\" + MyZipEntry.Name);
}
else
{
if (!Directory.Exists(ExtractDir + "\\" + Path.GetDirectoryName(MyZipEntry.Name)))
{
Directory.CreateDirectory(ExtractDir + "\\" + Path.GetDirectoryName(MyZipEntry.Name));
}
MyFileStream = new FileStream(ExtractDir + "\\" + MyZipEntry.Name, FileMode.OpenOrCreate, FileAccess.Write);
int count = 0;
byte[] buffer = new byte[4097];
count = MyZipInputStream.Read(buffer, 0, 4096);
while (count > 0)
{
MyFileStream.Write(buffer, 0, count);
count = MyZipInputStream.Read(buffer, 0, 4096);
}
MyFileStream.Close();
}
try
{
MyZipEntry = MyZipInputStream.GetNextEntry();
}
catch (Exception ex)
{
MyZipEntry = null;
}
}
if ((MyZipInputStream != null))
MyZipInputStream.Close();
if ((MyFileStream != null))
MyFileStream.Close();
}