Task <TradeTransResponsePacket> ITradeProvider.CloseOrder(int orderId, double volume)
{
var reqId = GetReqId();
var packet = new TradeTransRequestPacket(reqId, 0, TransactionType.OrderClose,
0, 0, 0, "", volume, orderId, string.Empty, new DateTime(1970, 1, 1));
var task = EnqueueTcs <TradeTransResponsePacket>(reqId);
apiConnection.SendPacket(packet);
return(task);
}