public void DownloadSync(string url, DeRequestTVKServer callback)
{
callbackRequest = callback;
client.DownloadDataAsync(new Uri(AppConst.ServerURL + url));
}
private void DownloadCheckedList()
{
RequestTVKServer sv = new RequestTVKServer();
DeRequestTVKServer callback = new DeRequestTVKServer(DownloadCheckedListCallback);
sv.DownloadSync("?action=checked_channels", callback);
}