Asp.net GZIP compression

// Authenticate here as we need Session and Request objects to be initialised
protected void Application_PreRequestHandlerExecute(Object sender, EventArgs e)
{

//HttpApplication app = sender as HttpApplication;
//string acceptEncoding = app.Request.Headers["Accept-Encoding"];
//System.IO.Stream prevUncompressedStream = app.Response.Filter;
//if (!(app.Context.CurrentHandler is Page || app.Context.CurrentHandler.IsReusable.GetType().Name == "SyncSessionlessHandler") || app.Request["HTTP_X_MICROSOFTAJAX"] != null)
//{
// return;
//}
//if (acceptEncoding == null || acceptEncoding.Length == 0)
//{
// return;
//}
//acceptEncoding = acceptEncoding.ToLower();
//if (acceptEncoding.Contains("deflate") || acceptEncoding == "*")
//{
// // defalte
// app.Response.Filter = new System.IO.Compression.DeflateStream(prevUncompressedStream, System.IO.Compression.CompressionMode.Compress);
// app.Response.AppendHeader("Content-Encoding", "deflate");
//}
//else if (acceptEncoding.Contains("gzip"))
//{
// // gzip
// app.Response.Filter = new System.IO.Compression.GZipStream(prevUncompressedStream, System.IO.Compression.CompressionMode.Compress);
// app.Response.AppendHeader("Content-Encoding", "gzip");
//}

}