A customer recently asked me how to plot a Line Chart from a simple array of type double, as he was not seeing his data plotted in the control.  It turned out that the Series's DataMapping property was not being set in the code, so I set it to an arbitrary string, and that allowed the data to be plotted.  I could have set it to String.Empty too.

The attached sample demonstrates the plotting of an array of double as a Line chart .