public class CategoryAxis : Axis 

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 = new DateTime( 2020, 1, 1 );
worksheet.Cells[ "B5" ].Value = new DateTime( 2021, 1, 1 ); ;
worksheet.Cells[ "B6" ].Value = new DateTime( 2022, 1, 1 );
worksheet.Cells[ "B7" ].Value = new DateTime( 2023, 1, 1 );
worksheet.Cells[ "B8" ].Value = new DateTime( 2024, 1, 1 );

// 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 LineChart with the generic Add method and set its SubType. The size of the Chart will be from Cell E4 to L18.
var lineChart = worksheet.Charts.Add<LineChart>( "E4", "L18" );
lineChart.SubType = LineChartSubType.LineWithMarkers;

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

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

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

// Adds LineSeries to the LineChart (y values) by specifying fixed values and a Range of Cells’ Adresses.
var lineSeries1 = lineChart.SeriesCollection.AddFromValues<LineSeries>( 5, 10, 15, 20, 40 );
lineSeries1.Name = "IBM";
var lineSeries2 = lineChart.SeriesCollection.AddFromCells<LineSeries>( "C4", "C8" );
lineSeries2.Name = "Apple";

// Customizes the Category & Value Axis Line.
lineChart.ValueAxis.Line.Color = Xceed.Drawing.Color.Blue;
lineChart.CategoryAxis.Line.Color = Xceed.Drawing.Color.Red;
lineChart.CategoryAxis.Line.Width = 3d;

// Sets the minimum and maximum value for the CategoryAxis.
lineChart.CategoryAxis.Minimum = new DateTime( 2020, 1, 1 );
lineChart.CategoryAxis.Maximum = new DateTime( 2023, 1, 1 );

// Sets where the ValueAxis will cross the CategoryAxis.
lineChart.CategoryAxis.CrossPositionType = CrossPositionType.Custom;
lineChart.CategoryAxis.CrossPositionCustomValue = new DateTime( 2021, 1, 1 );

// Shows the Major Tickmarks on the CategoryAxis.
lineChart.CategoryAxis.MajorTickMarksType = TickMarksType.Cross;

// Sets the position of the CategoryAxis’ labels on the TickMarks.
lineChart.CategoryAxis.IsBetweenTickMarks = false;

// Customizes & formats the CategoryAxis’ labels to display only the years.
lineChart.CategoryAxis.TickLabelsDistanceFromAxis = 500;
lineChart.CategoryAxis.TickLabels.TextFill.Color = Xceed.Drawing.Color.Red;
lineChart.CategoryAxis.TickLabels.CustomFormat = "yyyy";        

// Sets and customizes the CategoryAxis’ Title.
lineChart.CategoryAxis.Title.IsVisible = true;
lineChart.CategoryAxis.Title.Text = "Years";
lineChart.CategoryAxis.Title.TextOptions.TextFill.Color = Xceed.Drawing.Color.Red;
lineChart.CategoryAxis.Title.TextOptions.Font.Size = 15;
lineChart.CategoryAxis.Title.TextOptions.Font.Bold = true;

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