/// <summary>
        /// 文件下载2
        /// </summary>
        /// <param name="FileName">需要修改的文件名</param>
        /// <param name="FilePath">文件路径路径</param>
        public void BigFileDownload(string FileName, string FilePath)
        {
            System.IO.Stream iStream = null;

            // Buffer to read 10K bytes in chunk:
            byte[] buffer = new Byte[10000];

            // Length of the file:
            int length;

            // Total bytes to read:
            long dataToRead;

            // Identify the file to download including its path.
            string filepath = System.Web.HttpContext.Current.Server.MapPath(FilePath);

            // Identify the file name.
            string filename = System.IO.Path.GetFileName(filepath);

            try
            {
                // Open the file.
                iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
                            System.IO.FileAccess.Read, System.IO.FileShare.Read);

                // Total bytes to read:
                dataToRead = iStream.Length;

                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(FileName));//System.Text.UTF8Encoding.UTF8.GetBytes(FileName)

                // Read the bytes.
                while (dataToRead > 0)
                {
                    // Verify that the client is connected.
                    if (Response.IsClientConnected)
                    {
                        // Read the data in buffer.
                        length = iStream.Read(buffer, 0, 10000);

                        // Write the data to the current output stream.
                        Response.OutputStream.Write(buffer, 0, length);

                        // Flush the data to the HTML output.
                        Response.Flush();

                        buffer = new Byte[10000];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        //prevent infinite loop if user disconnects
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception ex)
            {
                // Trap the error, if any.
                string message = ex.Message;

            }
            finally
            {
                if (iStream != null)
                {
                    //Close the file.
                    iStream.Close();
                }
            }
        }

  //2下载
                        document.getElementById("ifrLoad").setAttribute("src", encodeURI("/Admin/Ts/Ts?filePath=" + url + "&fileName=" + name));
                 

    @*文件下载使用，勿删除*@
    <iframe id="ifrLoad" frameborder="0" name="weidu" scrolling="no"></iframe>