OpenFileDialog openfile = new OpenFileDialog();
                        openfile.Filter = "Bmp Picture(*.*)|*.bmp";
                        if (openfile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                        {
                            IsPictureImported = true;

                            Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);
                            Image img = new Bitmap(openfile.FileName);
                            img = DeleteBlankArea(img);
}