private void btnQryMktData_Click(object sender, EventArgs e) { if (TraderApi != null && !string.IsNullOrEmpty(txtQryMktData.Text)) { var req = new ThostFtdcQryDepthMarketDataField(); req.InstrumentID = txtQryMktData.Text; req.ExchangeID = ""; TraderApi.ReqQryDepthMarketData(req, ++this.iRequestID); } }