'Declaration Protected Overrides Sub ValidateDataForChart()
protected override void ValidateDataForChart()
When a chart is a stacked column chart, it cannot have both positive and negative data values. All data values must share the same sign. This does not apply to regular column charts, which can contain columns both above and below the X-Axis.
Subclass implementations should call the base class implementation, before adding additional data checks, and set dataIsValid appropriately if it hasn't already been set to False.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2