Image Resize

Image resize during upload?

protected void Button1_Click(object sender, EventArgs e)

    {

        newWidth = 100;

        newHeight = 100;

        string filename = FileUpload1.FileName.ToString();

        System.Drawing.Image image = System.Drawing.Image.FromStream(FileUpload1.PostedFile.InputStream);

        int oldWidth = image.Width;

        int oldHeight = image.Height;

        if (oldHeight > oldWidth)

        {

            if (((decimal)oldWidth / (decimal)oldHeight) > ((decimal)newWidth / (decimal)newHeight))

            {

                decimal ratio = (decimal)newWidth / oldWidth;

                newHeight = (int)(oldHeight * ratio);

            }

            else

            {

                decimal ratio = (decimal)newHeight / oldHeight;

                newWidth = (int)(oldWidth * ratio);

            }

            Bitmap bitmap = new Bitmap(newWidth, newHeight, PixelFormat.Format48bppRgb);

            bitmap.SetResolution(image.HorizontalResolution, image.VerticalResolution);

            Graphics graphics__1 = Graphics.FromImage(bitmap);

            graphics__1.Clear(Color.White);

            graphics__1.InterpolationMode = InterpolationMode.HighQualityBicubic;

            graphics__1.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight), new Rectangle(0, 0, oldWidth, oldHeight), GraphicsUnit.Pixel);

            graphics__1.Dispose();

            bitmap.Save(Server.MapPath("image/") + filename, ImageFormat.Jpeg);

        }

        else

        {

            Response.Write("select valid passport size image");

        }