public Task <Order> NewOrderAsync(Guid walletId, NewOrder order)
        {
            if (walletId == Guid.Empty)
            {
                throw new ArgumentException("walletId");
            }
            if (order == null)
            {
                throw new ArgumentNullException("order");
            }

            var request = new NewOrderMessageBuilder(walletId, order);

            return(SendAsync(request).ReadAsAsync <Order>());
        }
		public Task<Order> NewOrderAsync(Guid walletId, NewOrder order)
		{
			if (walletId == Guid.Empty)
				throw new ArgumentException("walletId");
			if (order == null)
				throw new ArgumentNullException("order");

			var request = new NewOrderMessageBuilder(walletId, order);
			return SendAsync(request).ReadAsAsync<Order>();
		}