Problem
When programatically adding a secondary x axis to a chart using ExcelApplication, a secondary y axis will automatically appear as well (and vice versa).
Solution
To hide a secondary axis in ASP.NET use the Visible property of the Axis element. Both the SecondaryCatagoryAxis property and the SecondaryValueAxis property, return an object that extends the Axis element.
The following code hides the secondary axes in ASP.NET:
Chart1.SecondaryCategoryAxis.Visible = false; //For the secondary X Axis
Chart1.SecondaryValueAxis.Visible = false; //For the secondary Y Axis
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