RM.Common/DotNetFile/FileDownHelper.cs

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using System;
using System.IO;
using System.Text;
using System.Threading;
using System.Web;

namespace RM.Common.DotNetFile
{
    public class FileDownHelper
    {
        public static string FileNameExtension(string FileName)
        {
            return Path.GetExtension(FileDownHelper.MapPathFile(FileName));
        }

        public static string MapPathFile(string FileName)
        {
            return HttpContext.Current.Server.MapPath(FileName);
        }

        public static void DownLoadold(string FileName)
        {
            string destFileName = FileDownHelper.MapPathFile(FileName);
            if (File.Exists(destFileName))
            {
                FileInfo fi = new FileInfo(destFileName);
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ClearHeaders();
                HttpContext.Current.Response.Buffer = false;
                HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(Path.GetFileName(destFileName), Encoding.UTF8));
                HttpContext.Current.Response.AppendHeader("Content-Length", fi.Length.ToString());
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.WriteFile(destFileName);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
            }
        }

        public static void DownLoad(string FileName)
        {
            string filePath = FileDownHelper.MapPathFile(FileName);
            long chunkSize = 204800L;
            byte[] buffer = new byte[chunkSize];
            FileStream stream = null;
            try
            {
                stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                long dataToRead = stream.Length;
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachement;filename=" + HttpUtility.UrlEncode(Path.GetFileName(filePath)));
                HttpContext.Current.Response.AddHeader("Content-Length", dataToRead.ToString());
                while (dataToRead > 0L)
                {
                    if (HttpContext.Current.Response.IsClientConnected)
                    {
                        int length = stream.Read(buffer, 0, Convert.ToInt32(chunkSize));
                        HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
                        HttpContext.Current.Response.Flush();
                        HttpContext.Current.Response.Clear();
                        dataToRead -= (long)length;