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System.Drawing.Image watermark = System.Drawing.Image.fromFile(Server.MapPath("watermark.gif"));
Bitmap srcImg = new Bitmap(Server.MapPath("example.jpg"));
Graphics graphics = Graphics.fromImage(srcImg);
graphics.DrawImage(watermark,
srcImg.Width - watermark.Width,
srcImg.Height - watermark.Height,
watermark.Width,
watermark.Height);
srcImg.Save(Server.MapPath("example_marked.jpg"));
graphics.Dispose();
srcImg.Dispose();
watermark.Dispose();
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