private void btnAddFrame_Click(object sender, EventArgs e) {
            String tempFileName = System.IO.Path.GetTempFileName() + ".avi";
            AviManager tempFile = new AviManager(tempFileName, false);
            Bitmap bitmap = (Bitmap)Image.FromFile(txtNewFrameFileName.Lines[0].Trim());
            tempFile.AddVideoStream(false, 1, bitmap);
            VideoStream stream = tempFile.GetVideoStream();
            for (int n = 1; n < txtNewFrameFileName.Lines.Length; n++) {
                if (txtNewFrameFileName.Lines[n].Trim().Length > 0) {
                    stream.AddFrame((Bitmap)Image.FromFile(txtNewFrameFileName.Lines[n]));
                }
            }
            editableStream.Paste(stream, 0, (int)numPastePositionBitmap.Value, stream.CountFrames);
            tempFile.Close();
            try { File.Delete(tempFileName); } catch (IOException) { }
        }