asp.net文件下载

这个是比较好用的下载文件的代码，可以下载大文件，资源占用小，可以限速，但是如果限速了就容易死机（在线的人多时），取之于网络

/**/ /// <summary>
    /// 输出硬盘文件，提供下载 支持大文件、续传、速度限制、资源占用小
    /// </summary>
    /// <param name="Request">Page.Request对象</param>
    /// <param name="Response">Page.Response对象</param>
    /// <param name="fileName">下载文件名</param>
    /// <param name="fullPath">带文件名下载路径</param>
    /// <param name="speed">每秒允许下载的字节数</param>
    /// <returns>返回是否成功</returns>
     public    bool  ResponseFile(HttpRequest Request, HttpResponse Response,  string  fileName,  string  fullPath,  long  speed)
     {
        try
        {
            FileStream myFile = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            BinaryReader br = new BinaryReader(myFile);
            try
            {
                Response.AddHeader("Accept-Ranges", "bytes");
                Response.Buffer = false;
                long fileLength = myFile.Length;
                long startBytes = 0;

                int pack = 1024; //1K bytes
                //int sleep = 200;   //每秒5次   即5*10K bytes每秒
                int sleep = (int)Math.Floor((decimal)1000 * pack / speed) + 1;
                if (Request.Headers["Range"] != null)
                {
                    Response.StatusCode = 206;
                    string[] range = Request.Headers["Range"].Split(new char[] { '=', '-' });
                    startBytes = Convert.ToInt64(range[1]);
                }
                Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
                if (startBytes != 0)
                {
                    Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength - 1, fileLength));
                }
                Response.AddHeader("Connection", "Keep-Alive");
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName));

                br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
                int maxCount = (int)Math.Floor((decimal)(fileLength - startBytes) / pack) + 1;

                for (int i = 0; i < maxCount; i++)
                {
                    if (Response.IsClientConnected)
                    {
                        Response.BinaryWrite(br.ReadBytes(pack));
                        //Thread.Sleep(sleep);//有问题，容易导致死机状态,只有设置了这里才可以限速，但在线人多时容易死机
                    }
                    else
                    {
                        i = maxCount;
                    }
                }
            }
            catch
            {
                return false;
            }
            finally
            {
                br.Close();
                myFile.Close();
            }
        }
        catch
        {
            return false;
        }
        return true;
    }