public class PieSeries : 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 a PieChart with the generic Add method. The size of the Chart will be from Cell E4 to L18.
var pieChart = worksheet.Charts.Add<PieChart>( "E4", "L18" );

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

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

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

// Adds PieSeries to the PieChart (y values) by specifying fixed values.
var pieSeries = pieChart.SeriesCollection.AddFromValues<PieSeries>( 5, 10, 15, 20, 40 );

// Explodes the slices by 10%.
pieSeries.Explosion = 10;

// Customizes the Stroke of each of the pie slices.
pieSeries.Stroke.Width = 2;
pieSeries.Stroke.Color = Xceed.Drawing.Color.Black;

// Displays & customizes the DataPointLabels.
pieSeries.DataPointLabels.ShowValue = true;
pieSeries.DataPointLabels.Position = PieSliceDataPointLabelsPositionType.OutsideEnd;
pieSeries.DataPointLabels.TextOptions.CustomFormat = "0.0";

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