public override sdkxdr.Operation.OperationBody ToOperationBody()
        {
            var op = new sdkxdr.ManageOfferOp();

            op.Selling = Selling.ToXdr();
            op.Buying  = Buying.ToXdr();
            var amount = new sdkxdr.Int64();

            amount.InnerValue = ToXdrAmount(Amount);
            op.Amount         = amount;
            var price = Kin.Stellar.Sdk.Price.FromString(Price);

            op.Price = price.ToXdr();
            var offerId = new sdkxdr.Uint64();

            offerId.InnerValue = OfferId;
            op.OfferID         = offerId;

            var body = new sdkxdr.Operation.OperationBody();

            body.Discriminant  = sdkxdr.OperationType.Create(sdkxdr.OperationType.OperationTypeEnum.MANAGE_OFFER);
            body.ManageOfferOp = op;

            return(body);
        }
            /// <summary>
            ///     Construct a new CreateAccount builder from a CreateAccountOp XDR.
            /// </summary>
            /// <param name="op">
            ///     <see cref="sdkxdr.ManageOfferOp" />
            /// </param>
            public Builder(sdkxdr.ManageOfferOp op)
            {
                _Selling = Asset.FromXdr(op.Selling);
                _Buying  = Asset.FromXdr(op.Buying);
                _Amount  = FromXdrAmount(op.Amount.InnerValue);
                var n = new decimal(op.Price.N.InnerValue);
                var d = new decimal(op.Price.D.InnerValue);

                _Price  = decimal.Divide(n, d).ToString();
                offerId = op.OfferID.InnerValue;
            }