下载指定文件

//DownloadFile(Page.Response, "D:\\a\\Brains.doc");
    public void DownloadFile(HttpResponse response, string serverPath)
    {
        FileStream fs = null;
        try
        {
            fs = File.OpenRead(serverPath);
            byte[] buffer = new byte[1024];
            long count = 1024;
            response.Buffer = true;

            response.AddHeader("Connection", "Keep-Alive");
            response.ContentType = "application/octet-stream";
            response.AddHeader("Content-Disposition", "attachment;filename=" + Path.GetFileName(serverPath));//下载时要保存的默认文件名
            response.AddHeader("Content-Length", fs.Length.ToString());
            while (count == 1024)
            {
                count = fs.Read(buffer, 0, 1024);
                response.BinaryWrite(buffer);
            }

        }
        catch
        {
        }
        finally
        {
            fs.Close();
        }
    }