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{excerpt}Returns the border around the chart region.{excerpt}
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 public ChartLine BorderLine{ get; }
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Public ReadOnly Property BorderLine() As ChartLine
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By default, the borderline of [Chart.ChartArea] for new charts are visible. All other border lines for all other components of a chart are not visible by default.

If a default borderline is visible, which is the case for Chart area borderline, the default configuration for the line is:
* [Color|ChartLine.Color]: Color.SystemColor.AutomaticLine
* [Style|ChartLine.Style]: ChartLine.LineStyle.Solid
* [Weight|ChartLine.Weight]: ChartLine.LineWeight.Narrow

If a default borderline is invisible, as is the case with legends, data labels, titles, and axes, the defaults are as follows:
* [Color|ChartLine.Color]: Color.SystemColor.Black
* [Style|ChartLine.Style]: ChartLine.LineStyle.None
* [Weight|ChartLine.Weight]: ChartLine.LineWeight.Narrow

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