C# Image Download

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Net;

namespace ConsoleApplication1Web
{
    public class DownloadImage
    {
        private string imageUrl;
        private Bitmap bitmap;
        public DownloadImage(string imageUrl)
        {
            this.imageUrl = imageUrl;
        }
        public void Download()
        {
            try
            {
                WebClient client = new WebClient();
                Stream stream = client.OpenRead(imageUrl);
                bitmap = new Bitmap(stream);
                stream.Flush();
                stream.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
        public Bitmap GetImage()
        {
            return bitmap;
        }
        public void SaveImage(string filename, ImageFormat format)
        {
            if (bitmap != null)
            {
                try
                {
                    bitmap.Save(filename, format);
                }
                catch (Exception ex)
                {

                }
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            string stpath = @"http://assets.worldwildlife.org/photos/1231/images/hero_full/Forest-1600x1200px.jpg?1345589439";
            DownloadImage dimg = new DownloadImage(stpath);
            dimg.Download();
            dimg.SaveImage("foo.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
        }
    }
}