Dear experts,

I have a problem with bar chart. As you see the attachment, when the bar has no value (double.NaN), the bar chart will not show the corresponding label of the bar. However, when I draw the line on the chart, all the x labels are there. The desirable thing is to show all the labels no matter the bar has values or not. How can I set the chart? Would you please help on that?

Thank you in advance.