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string str1 = Server.MapPath(mapho);//ÒªÌí¼ÓˮӡµÄͼƬ
string str2 = Server.MapPath("WaterMark.jpg");//Ìí¼ÓµÄÄÚÈÝͼƬ
System.Drawing.Image bmp = System.Drawing.Image.fromFile(str1);
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gs.DrawImage(bmp2, bmp.Width-bmp2.Width, bmp.Height - bmp2.Height, bmp2.Width, bmp2.Height);
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