public void AddWaterPic（）
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    //图片水印
string bg = Request.MapPath("~/images/bg.jpg");//背景图
        string newPath = Request.MapPath("~/newImages/");//保存路径
        string shuiyin= Request.MapPath("~/images/scrollBlock.jpg");//水印图片
      System.Drawing.Image image = System.Drawing.Image.FromFile(bg); //取出背景图片
      System.Drawing.Image img = System.Drawing.Image.FromFile(shuiyin);//取出水印图片

      Graphics g = Graphics.FromImage(image);

     Rectangle rectbg = new Rectangle(932, 728, image.Width, image.Height); //水印的坐标宽932,高728

     g.DrawImage(img, rectbg , 0, 0, img.Width, img.Height, GraphicsUnit.Pixel); //在指定位置并且按大小绘制水印图片


//文字水印
   DateTime dt = Convert.ToDateTime(Date);
   g.DrawString(dt.ToString("yyyy年MM月dd日"), f, b, 934, 730);
   newImageName = (dt.ToString("yyyyMMddhhmmssms") + ".jpg");
    System.Drawing.Image cover = System.Drawing.Image.FromFile(newPath + newImageName);
        Response.ContentType = "image/jpeg";//设置输出类型为JPEG图片
        cover.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);//将修改的图片存入输出流
        cover.Dispose();//输出图片到客户端
         Response.End();
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