给图片加水印为什么加不下去呢？

给图片加水印为什么加不上去呢？？
public void ProcessRequest(HttpContext context)
{ string path = context.Request.PhysicalPath;
string defaultPath = context.Server.MapPath("~/Images/default.jpg");
string watherPath = context.Server.MapPath("~/Images/WaterMark.jpg");
Image cover;
if (File.Exists(path))
{
Image water = Image.FromFile(watherPath);
cover= Image.FromFile(path);
Graphics g = Graphics.FromImage(cover);
g.DrawImage(water, cover.Width - water.Width, cover.Height - water.Height, water.Width, water.Height);
g.Dispose();}
else
{cover = Image.FromFile(defaultPath);}
context.Response.ContentType = "image/jpeg";
cover.Save(context.Response.OutputStream, ImageFormat.Jpeg);
cover.Dispose();
context.Response.End();
}

------解决方案--------------------

C# code


            string path = context.Request.PhysicalPath;
            string water = context.Server.MapPath("~/image/water.jpg");
            Image img = null;
            if (!File.Exists(path))
            {
                string defaultPath = context.Server.MapPath("~/image/default.gif");
                img = Image.FromFile(defaultPath);
            }
            else
            {
                img = Image.FromFile(path);
                Image waterImage = Image.FromFile(water);
                Graphics g = Graphics.FromImage(img);
                g.DrawImage(waterImage, new Rectangle(img.Width - waterImage.Width, img.Height - waterImage.Height, waterImage.Width, waterImage.Height), new Rectangle(0, 0, waterImage.Width, waterImage.Height), GraphicsUnit.Pixel);
                waterImage.Dispose();
                g.Dispose();
            }
            img.Save(context.Response.OutputStream, ImageFormat.Jpeg);
            img.Dispose();
            context.Response.ContentType = "image/jpeg";
            context.Response.End();

给图片加水印为什么加不下去呢？

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