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Gets or sets the plot order for the selected series within the chart group.
The plot order determines the position of the series relative to other series in the same chart group.
int PlotOrder { get; set; }
Property PlotOrder As Integer
worksheet.Range["A1:C4"].Value = new object[,] {{"Month", "Sales", "Target"}, {"Jan", 12, 30}, {"Feb", 18, 45}, {"Mar", 15, 40}};
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:C4"]);
ISeries series = chart.SeriesCollection[1];
int plotOrder = series.PlotOrder;