IChart SecondaryCategoryAxis Property

<para>//Create worksheet</para><para>Workbook workbook = new Workbook();</para><para>Worksheet worksheet = workbook.Worksheets[0];</para><para>//Add data</para><para>worksheet.Range["A1"].Text = "Jan";
 worksheet.Range["B1"].Text = "Feb";
 worksheet.Range["C1"].Text = "Mar";
 worksheet.Range["A2"].Text = "10";
 worksheet.Range["B2"].Text = "20";
 worksheet.Range["C2"].Text = "30";
 worksheet.Range["A3"].Value = "100";
 worksheet.Range["B3"].Value = "200";
 worksheet.Range["C3"].Value = "300";</para><para>//Create chart and range</para><para>Chart chart = worksheet.Charts.Add();</para><para>chart.DataRange = worksheet.Range["A1:C3"];</para><para>//Set secondary axis</para><para>IChartSerie serie = chart.Series[1];</para><para>serie.UsePrimaryAxis = false;</para><para>chart.SecondaryCategoryAxis.Visible = true;</para><para>//Save to file</para><para>workbook.SaveToFile("Chart.xlsx");</para>