public frmFileDownloader(string Url,string SaveTo)
        {
            InitializeComponent();
            var folder = Path.GetDirectoryName(SaveTo);
            string file = Path.GetFileName(SaveTo);
            downloader = new FileDownloader(Url, folder, file);
            downloader.ProgressChanged += downloader_ProgressChanged;
            downloader.RunWorkerCompleted += downloader_RunWorkerCompleted;

            downloader.RunWorkerAsync();
        }