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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);
  Graphics gs = Graphics.fromImage(bmp);
System.Drawing.Image bmp2 = System.Drawing.Image.fromFile(str2);
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  gs.DrawImage(bmp2, bmp.Width-bmp2.Width, bmp.Height - bmp2.Height, bmp2.Width, bmp2.Height);
  Response.ContentType = "image/jpeg";//Êä³öÀàÐÍ
  bmp.Save(Response.OutputStream,ImageFormat.Jpeg);//±£´æ
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