public class RadarSeries : Series 

var workbook = Workbook.Create( ChartSample.ChartSampleOutputDirectory + @"AddCharts.xlsx" );

// Gets the first Worksheet. A Workbook always contains at least 1 Worksheet.
var worksheet = workbook.Worksheets[ 0 ];

// Adds Values for Category.
worksheet.Cells[ "B4" ].Value = 2020;
worksheet.Cells[ "B5" ].Value = 2021;
worksheet.Cells[ "B6" ].Value = 2022;
worksheet.Cells[ "B7" ].Value = 2023;
worksheet.Cells[ "B8" ].Value = 2024;

// Adds Values for Series.
worksheet.Cells[ "C4" ].Value = 20;
worksheet.Cells[ "C5" ].Value = 28;
worksheet.Cells[ "C6" ].Value = 33;
worksheet.Cells[ "C7" ].Value = 12;
worksheet.Cells[ "C8" ].Value = 45;

// Adds a RadarChart with the generic Add method and sets its subType. The size of the Chart will be from Cell E4 to L18.
var radarChart = worksheet.Charts.Add<RadarChart>( "E4", "L18" );
radarChart.SubType = RadarChartSubType.Marker;

// Sets the Chart's Title.
radarChart.Title.Text = "Profits";
radarChart.Title.TextOptions.Font.Bold = true;

// Sets the Legend.
radarChart.Legend.Position = LegendPositionType.Right;

// Sets the Category data(x values) for the RadarChart : Cells B4 to B8.
radarChart.CategoryData = CategoryData.FromCells( worksheet, "B4", "B8" );

// Adds RadarSeries to the radarChart (y values) by specifying fixed values and a range of Cells’ Adresses.
var radarSeries1 = radarChart.SeriesCollection.AddFromValues<RadarSeries>( 5, 10, 15, 20, 40 );
radarSeries1.Name = "IBM";
var radarSeries2 = radarChart.SeriesCollection.AddFromCells<RadarSeries>( "C4", "C8" );
radarSeries2.Name = "Apple";

// Customizes the Series’ markers.
radarSeries1.Marker.Symbol = MarkerSymbol.Square;
radarSeries1.Marker.Size = 9;
radarSeries2.Marker.Symbol = MarkerSymbol.SquarePlus;
radarSeries2.Marker.Size = 12;
radarSeries2.Marker.Border.Color = Xceed.Drawing.Color.Orange;

// Customizes the Series’s colors
radarSeries1.Stroke.Color = Xceed.Drawing.Color.Red;
radarSeries2.Stroke.Color = Xceed.Drawing.Color.Green;

// Saves Workbook to disk.
workbook.Save();