private void ZipAllFiles(string ScratchDirectory, string _filename)
{
if (File.Exists(_filename))
{
File.Delete(_filename);
}
using (var zip = new ZipFile(_filename))
{
zip.CompressionLevel = Ionic.Zlib.CompressionLevel.None;
var files = Directory.EnumerateFiles(ScratchDirectory);
zip.AddFiles(files, "");
zip.Save();
}
}