image resize prob

[ajijacobm]

hi,i'm beginner in asp..I'm doing a work on image resizing..i've my source code but it is showing a generic gdi error occured...

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Drawing;
using System.Text;
using System.Collections.Generic;
using System.ComponentModel;

namespace file
{
    public class conn
    {
        public void photos(string filename, string destfile)
        {
            Bitmap b = new Bitmap(filename);
            System.Drawing.Image i = resizeImage(b, new Size(100, 100));
            saveJpeg(destfile, (Bitmap)i, 100);
        }
        private static System.Drawing.Image resizeImage(System.Drawing.Image imgToResize, Size size)
        {
            int sourceWidth = imgToResize.Width;
            int sourceHeight = imgToResize.Height;

            float nPercent = 0;
            float nPercentW = 0;
            float nPercentH = 0;

            nPercentW = ((float)size.Width / (float)sourceWidth);
            nPercentH = ((float)size.Height / (float)sourceHeight);

            if (nPercentH < nPercentW)
                nPercent = nPercentH;
            else
                nPercent = nPercentW;

            int destWidth = (int)(sourceWidth * nPercent);
            int destHeight = (int)(sourceHeight * nPercent);

            Bitmap b = new Bitmap(destWidth, destHeight);
            Graphics g = Graphics.FromImage((System.Drawing.Image)b);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

            g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
            //g.Dispose();

            return (System.Drawing.Image)b;
        }
        private void saveJpeg(string path, Bitmap img, long quality)
        {
            // Encoder parameter for image quality
            System.Drawing.Imaging.EncoderParameter qualityParam = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

            // Jpeg image codec
            System.Drawing.Imaging.ImageCodecInfo jpegCodec = this.getEncoderInfo("image/jpeg");

            if (jpegCodec == null)
                return;

            System.Drawing.Imaging.EncoderParameters encoderParams = new System.Drawing.Imaging.EncoderParameters(1);
            encoderParams.Param[0] = qualityParam;

            img.Save(path, jpegCodec, encoderParams);
        }
        private System.Drawing.Imaging.ImageCodecInfo getEncoderInfo(string mimeType)
        {
            // Get image codecs for all image formats
            System.Drawing.Imaging.ImageCodecInfo[] codecs = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();

            // Find the correct image codec
            for (int i = 0; i < codecs.Length; i++)
                if (codecs[i].MimeType == mimeType)
                    return codecs[i];
            return null;
        }
    }
}

//ie defallt.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace file
{
    public partial class _Default : System.Web.UI.Page
    {
        conn mc = new conn();
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {

            if (FileUpload1.HasFile)
            {
                string a = FileUpload1.PostedFile.FileName;
               string b= Server.MapPath("") + "\\" + a;
                FileUpload1.PostedFile.SaveAs(Server.MapPath("") + "\\" + a);
                mc.photos(b, b);
            }
        }
    }
}

i'e also attached my source code along with this.

[kvprajapati]

Line #71 - Use different filename to save an image.

img.Save("c:\\sample.gif", jpegCodec, encoderParams);