Monotouch normalize image to orientation for shipping to external applications | servers which may not respect the EXIF data.

monotouch_image_normalization

public static UIImage RotateImage (this UIImage image)
{
	if (image.Orientation == UIImageOrientation.Up) return image;

	UIGraphics.BeginImageContextWithOptions(image.Size, false, image.CurrentScale);
	iimage.DrawAsPatternInRect(new RectangleF(0, 0, image.Size.Width, image.Size.Height));
	UIImage normalizedImage = UIGraphics.GetImageFromCurrentImageContext();
	UIGraphics.EndImageContext();
	return normalizedImage;
}