NGif, Animated GIF Encoder for .NET

private int NextPixel()
{
  if (curPixel <= pixAry.GetUpperBound(0))
  {
    byte pix = pixAry[curPixel++];
    return pix && 0xff;
  }
  else
    return (EOF);
}

Thread t = new Thread(delegate()
                {
                    try
                    {
                        foreach (var filePath in imageFilePaths)
                        {
                            new FileInfo(filePath).Delete();
                        }
                    }
                    catch (IOException ex)
                    {
 
                        /* DoNothing */
                    }
                });
 
            t.Start();

string _tempID = Path.GetFileNameWithoutExtension(_file);
 
string _path = String.Format(@"~/assets/images/temp/{0}/{1}", this.Session.SessionID, _tempID.ToString());
_path = Server.MapPath(_path);
if (!System.IO.Directory.Exists(_path))
	System.IO.Directory.CreateDirectory(_path);
 
GifDecoder _gifDecoder = new GifDecoder();
_gifDecoder.Read(_file);
 
for (int i = 0, count = _gifDecoder.GetFrameCount(); i < count; i++)
{
	System.Drawing.Image frame = _gifDecoder.GetFrame(i);  // frame i
	frame.Save(String.Format(@"{0}\{1}.png", _path, Guid.NewGuid().ToString()), ImageFormat.Png);
}
 
AnimatedGifEncoder _encoder = new AnimatedGifEncoder();
_encoder.SetTransparent(Color.Empty);
 
// make a memory stream to work with the image bytes
using (FileStream imageStream = 
	new FileStream( _path + @"\temp.gif" ,FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
{
	_encoder.Start(imageStream);
	_encoder.SetDelay(_gifDecoder.GetDelay(0)); // time between images			
	_encoder.SetRepeat(0); //-1:no repeat,0:always repeat

	string[] _imagePaths = System.IO.Directory.GetFiles(_path, "*.png");
 
	for (int i = 0, count = _imagePaths.Length; i < count; i++)
		_encoder.AddFrame(this.resize(_imagePaths[i], newWidth, newHeight, _increaseImageSize));
 
	// make byte array the same size as the image
	byte[] imageContent = new Byte[imageStream.Length];
 
	// rewind the memory stream
	imageStream.Position = 0;
 
	// load the byte array with the image
	imageStream.Read(imageContent, 0, (int)imageStream.Length);
 
	// return byte array to caller with image type
	this.Response.ContentType = _contentType;
	this.Response.AddHeader("content-length", System.Convert.ToString(imageStream.Length));
 
	this.Response.BinaryWrite(imageContent);
}
 
try
{
  foreach (string _f in System.IO.Directory.GetFiles(_path))
    System.IO.File.Delete(_f);
 
  System.IO.Directory.Delete(_path);
  System.IO.Directory.Delete(System.IO.Directory.GetParent(_path).ToString());
}
catch (Exception _ex) { Console.Write(_ex.ToString());}
 
_encoder.Finish();
 
_encoder = null;
_gifDecoder = null;
 
this.Response.End();