public class DoughnutSeries : PieSeries 

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 a DoughnutChart with the generic Add method. The size of the Chart will be from Cell E4 to L18.
var doughnutChart = worksheet.Charts.Add<DoughnutChart>( "E4", "L18" );

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

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

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

doughnutChart.HoleSize = 50;

// Adds DoughnutSeries to the DoughnutChart (y values) by specifying fixed values.
var doughnutSeries = doughnutChart.SeriesCollection.AddFromValues<DoughnutSeries>( 5d, 10d, 15d, 20d, 40d );

// Explodes the DoughnutSeries slices to 15%.
doughnutSeries.Explosion = 15;

// Customizes the DoughnutSeries’ Stroke.
doughnutSeries.Stroke.Width = 2;
doughnutSeries.Stroke.Color = Xceed.Drawing.Color.Black;

doughnutSeries.DataPointLabels.ShowValue = true;
doughnutSeries.DataPointLabels.TextOptions.TextFill.Color = Xceed.Drawing.Color.White;

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