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);
}
}