Hi Rob O,
I seriously apologies for the wrong information about the chart with 2 Y Axis. It is possible to have 2 y-axis in an excel chart. After discussing with my team I have came out with a sample, which demonstrate a chart with 2 y-axis. Please look at sample and let me know if you have any other difficulties. Once again I apologies for the inconvenience.
if(chart.SecondaryValueAxis != null)
chart.SecondaryValueAxis.Title = "Secondary Value Axis";
//Here is the code to display secondary axis.
chart.SecondaryValueAxis.IsMaxCross=true;
chart.SecondaryCategoryAxis.IsMaxCross=true;
Sample:
2-Yaxis.zipThanks for your interest in XlsIO.
Best regards,
Chella.