private void QueryTicket(string from, string to, DateTime date) { var ticketResult = _client.QueryTicket(date.ToString("yyyy-MM-dd"), from, to); if (ticketResult != null) { var document = ParseQueryDocument(TicketsToString(ticketResult.data)); if (this.InvokeRequired) { this.Invoke((MethodInvoker)(() => { this.webBrowser.DocumentText = document; })); } else { this.webBrowser.DocumentText = document; } } }