public class Pie3DChart : Chart3D 

// 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;
worksheet.Cells[ "D4" ].Value = 7;
worksheet.Cells[ "D5" ].Value = 33;
worksheet.Cells[ "D6" ].Value = 15;
worksheet.Cells[ "D7" ].Value = 35;
worksheet.Cells[ "D8" ].Value = 25;

// Adds a Pie3DChart with the generic Add method. The size of the Chart will be from Cell E4 to L18.
var pie3DChart = worksheet.Charts.Add<Pie3DChart>( "E4", "L18" );

// Sets the Chart's Title.
pie3DChart.Title.Text = "Profits";
pie3DChart.Title.TextOptions.Font.Bold = true;

// Sets the Legend.
pie3DChart.Legend.Position = LegendPositionType.Right;

// Sets the Category data(x values) for the Pie3DChart : Cells B4 to B8.
pie3DChart.CategoryData = CategoryData.FromCells( worksheet, "B4", "B8" );

// Add PieSeries to the Pie3DChart (y values) by specifying fixed values.
var pieSeries1 = pie3DChart.SeriesCollection.AddFromValues<PieSeries>( 5, 10, 15, 20, 40 );

// Shows the Series values in the Pie3D chart.
pieSeries1.DataPointLabels.ShowValue = true;

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