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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);
}