Gets or sets the background image of a legend.
Assembly: System.Web.DataVisualization (in System.Web.DataVisualization.dll)
This property defines a path to a background image for a Chart legend, and can be an absolute or relative URL.
You can also specify one of the colors displayed by the image as "transparent", by setting the BackImageTransparentColor property.
An image can originate from any valid graphics file supported by .NET Framework, including icons.
Background images take precedence over other background properties such as gradient color.