How to create a chart sheet in C#.NET

/* -----------------------------------------------------
 * Tutorial 21
 * 
 * This tutorial shows how to create an Excel file in C# 
 * having a worksheet and a chart sheet.
 * ----------------------------------------------------- */

using System;
using EasyXLS;
using EasyXLS.Charts;
using EasyXLS.Constants;

public class Tutorial21
{
    [STAThread]
    static void Main()
    {
        Console.WriteLine("Tutorial 21\n-----------\n");

        // Create an instance of the class that exports Excel files
        ExcelDocument workbook = new ExcelDocument();
    
        // Create an worksheet
        workbook.easy_addWorksheet("SourceData");

        // Get the table of data for the worksheet
        ExcelTable xlsTable1 = ((ExcelWorksheet)workbook.easy_getSheet("SourceData")).easy_getExcelTable();

        // Add data in cells for report header
        xlsTable1.easy_getCell(0, 0).setValue("Show Date");
        xlsTable1.easy_getCell(0, 1).setValue("Available Places");
        xlsTable1.easy_getCell(0, 2).setValue("Available Tickets");
        xlsTable1.easy_getCell(0, 3).setValue("Sold Tickets");

        // Add data in cells for chart report values
        xlsTable1.easy_getCell(1, 0).setValue("03/13/2005 00:00:00");
        xlsTable1.easy_getCell(1, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);
        xlsTable1.easy_getCell(2, 0).setValue("03/14/2005 00:00:00");
        xlsTable1.easy_getCell(2, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);
        xlsTable1.easy_getCell(3, 0).setValue("03/15/2005 00:00:00");
        xlsTable1.easy_getCell(3, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);
        xlsTable1.easy_getCell(4, 0).setValue("03/16/2005 00:00:00");
        xlsTable1.easy_getCell(4, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);

        xlsTable1.easy_getCell(1, 1).setValue("10000");
        xlsTable1.easy_getCell(2, 1).setValue("5000");
        xlsTable1.easy_getCell(3, 1).setValue("8500");
        xlsTable1.easy_getCell(4, 1).setValue("1000");

        xlsTable1.easy_getCell(1, 2).setValue("8000");
        xlsTable1.easy_getCell(2, 2).setValue("4000");
        xlsTable1.easy_getCell(3, 2).setValue("6000");
        xlsTable1.easy_getCell(4, 2).setValue("1000");

        xlsTable1.easy_getCell(1, 3).setValue("920");
        xlsTable1.easy_getCell(2, 3).setValue("1005");
        xlsTable1.easy_getCell(3, 3).setValue("342");
        xlsTable1.easy_getCell(4, 3).setValue("967");

        // Set column widths
        xlsTable1.easy_getColumnAt(0).setWidth(100);
        xlsTable1.easy_getColumnAt(1).setWidth(100);
        xlsTable1.easy_getColumnAt(2).setWidth(100);
        xlsTable1.easy_getColumnAt(3).setWidth(100);
    
        // Add a chart sheet
        workbook.easy_addChart("Chart", "=SourceData!$A$1:$D$5", Chart.SERIES_IN_COLUMNS);

        // Export Excel file
        Console.WriteLine("Writing file C:\\Samples\\Tutorial21 - chart sheet in Excel.xlsx.");
        workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial21 - chart sheet in Excel.xlsx");

        // Confirm export of Excel file
        String sError = workbook.easy_getError();
        if (sError.Equals(""))
            Console.Write("\nFile successfully created. Press Enter to Exit...");
        else
            Console.Write("\nError encountered: " + sError + "\nPress Enter to Exit...");

        // Dispose memory
        workbook.Dispose();

        Console.ReadLine();
    }
}