bitmap blank

Hi , is there anything wrong with my code below? How come the image that is saved always a blank black image? vs. the image from the sFilePath?

Code:

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          Image img = Image.FromFile(sFilePath);
            iUpHeight = img.Height;

            iUpWidth = img.Width;
            int iNewHeight = 300;
            int iNewWidth = 450;
            decimal reduce;

            Bitmap upBmp = (Bitmap)(Bitmap.FromFile(sFilePath));
            Bitmap bmp = new Bitmap(iNewWidth, iNewHeight);

            if (iUpWidth > iUpHeight)
            {
                reduce = iNewWidth / iUpWidth;
                iNewHeight = (int)(iUpHeight * reduce);
               
            }

            bmp.SetResolution(72, 72);
            Graphics graphic = Graphics.FromImage(bmp);
           
            graphic.DrawImage(upBmp, 0, 0, iNewWidth, iNewHeight);
            graphic.Dispose();
            bmp.Save(HttpContext.Current.Server.MapPath("~/Photos/test.jpg"));

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