How can I post an order by API

Question

I wrote a sample code to test Binance Api :

 var apiClient = new ApiClient("API-Key", "API-Secret");
 var binanceClient = new BinanceClient(apiClient);

But program hangs when run the below method :

var buyOrder = binanceClient.PostNewOrder("ethbtc", 1m, 0.045m, OrderSide.BUY).Result;