[]
Gets the ILineFormat object for the chart element.
Use the returned ILineFormat object to access and modify the line formatting properties of the specified chart element.
ILineFormat Line { get; }
ReadOnly Property Line As ILineFormat
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 360, 220).Chart;
IChartFormat format = chart.ChartArea.Format;
ILineFormat line = format.Line;
line.Color.RGB = Color.Red;