using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Diagnostics;
 
namespace TrackTransferFile
{
	public class DownloadFile : IHttpHandler
	{
		public void ProcessRequest(HttpContext context)
		{
			HttpResponse response = context.Response;
			response.ContentType = "image/jpeg";
			response.AddHeader("Content-Disposition", "attachment; filename=erde.jpg");
			using (FileStream fs = new FileStream(context.Server.MapPath("erde.jpg"), _
  FileMode.Open, FileAccess.Read))
			{
				response.AddHeader("Content-Length", fs.Length.ToString());
				int bytesWritten = 0;
				using (BinaryReader br = new BinaryReader(fs))
				{
					byte[] buff = br.ReadBytes(512);
					while (buff.Length > 0 && response.IsClientConnected)
					{
						Debug.WriteLine(string.Format("Writing bytes {0} of {1} to response", _
  bytesWritten, fs.Length));
						response.BinaryWrite(buff);
						response.Flush();
						bytesWritten += buff.Length;
						buff = br.ReadBytes(512);
					}
 
					if (bytesWritten == fs.Length)
					{
						Debug.WriteLine("All bytes written");
					}
					else
					{
						Debug.WriteLine(string.Format("Only {0} bytes of {1} had been written", _
  bytesWritten, fs.Length));
					}
				}
			}
		}
 
		public bool IsReusable { get { return false; } }
	}
}