Resizing image using asp.net c#

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C#

ASP.NET

Hi,
i have written a code for saving original image and saving resized image in database using asp.net c#.

 string imgName = FileUpload1.FileName.ToString();
      //sets the image path
        string imgPath = "~/upload/" + imgName;
        string imgPath2 = "~/small upload/" + imgName;
        //get the size in bytes that
        filepath = Server.MapPath(imgPath);
        filepath2 = Server.MapPath(imgPath2);
        FileUpload1.SaveAs(Server.MapPath(imgPath));
        ResizeImage(30,filepath,filepathsmall);



        FileStream fs = new FileStream(filepath2, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fs);
        Byte[] bytes = br.ReadBytes((Int32)fs.Length);
        br.Close();
        fs.Close();
        string strQuery = "INSERT INTO products(name, description, image,category,price,imagepath) VALUES(@NM, @EM, @PN,@CT,@PC,@IP)";
        SqlCommand cmd = new SqlCommand(strQuery);
        cmd.Parameters.AddWithValue("@NM", name);
        cmd.Parameters.AddWithValue("@EM", desc);
        cmd.Parameters.AddWithValue("@PN", bytes);
        cmd.Parameters.AddWithValue("@CT", category);
        cmd.Parameters.AddWithValue("@PC", price);
        cmd.Parameters.AddWithValue("@IP", imgPath2);
        InsertData(cmd);

Functions
public static void ResizeImage(int size, string filePath, string saveFilePath)
    {
        //variables for image dimension/scale
        double newHeight = 0;
        double newWidth = 0;
        double scale = 0;

        //create new image object
        Bitmap curImage = new Bitmap(filePath);

        //Determine image scaling
        if (curImage.Height > curImage.Width)
        {
            scale = Convert.ToSingle(size) / curImage.Height;
        }
        else
        {
            scale = Convert.ToSingle(size) / curImage.Width;
        }
        if (scale < 0 || scale > 1) { scale = 1; }

        //New image dimension
        newHeight = Math.Floor(Convert.ToSingle(curImage.Height) * scale);
        newWidth = Math.Floor(Convert.ToSingle(curImage.Width) * scale);

        //Create new object image
        Bitmap newImage = new Bitmap(curImage, Convert.ToInt32(newWidth), Convert.ToInt32(newHeight));
        Graphics imgDest = Graphics.FromImage(newImage);
        imgDest.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        imgDest.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        imgDest.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
        imgDest.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
        EncoderParameters param = new EncoderParameters(1);
        param.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);

        //Draw the object image
        imgDest.DrawImage(curImage, 0, 0, newImage.Width, newImage.Height);

        //Save image file
        newImage.Save(saveFilePath, info[1], param);

        //Dispose the image objects
        curImage.Dispose();
        newImage.Dispose();
        imgDest.Dispose();
    }

can you tell me in which format should we give size factor.when i compile i am getting error
A generic error occurred in GDI+.
can you help me solve this eeror or suggest me another code