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image extension changed after uploading

Posted By:      Posted Date: October 20, 2010    Points: 0   Category :ASP.Net


        I have a requirement  where image has to be uploaded  to a folder and show it in image control. When uploading the image i have resized the image through code and saved it in a folder. The code is as follow

Stream src = fuUpload.PostedFile.InputStream;
                        string dest = Server.MapPath("~/folder/" + filename);                        
                        System.Drawing.Image img = System.Drawing.Image.FromStream(src);

 Bitmap target = new Bitmap(width, height);
                        Graphics graphics = Graphics.FromImage(target);
                        graphics.SmoothingMode = SmoothingMode.HighQuality;
                        graphics.CompositingQuality = CompositingQuality.HighQuality;
                        graphics.InterpolationMode = InterpolationMode.High;
                        Rectangle rectDestination = new Rectangle(0, 0, width, height);
                        graphics.DrawImage(img, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);

Everything is alright upto here. But when i right click on image control and try to save the pic, the

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