using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using Bytescout.Spreadsheet;
using System.IO;

namespace CSharp
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create new Spreadsheet
            Spreadsheet document = new Spreadsheet();

            // Add new worksheet
            Worksheet worksheet = document.Workbook.Worksheets.Add("HelloWorld");

            // Set cell value
            worksheet.Cell(0, 0).Value = "Hello, World!";

            if (File.Exists("Output.xlsx"))
            {
                File.Delete("Output.xlsx");
            }

            // Save document
            document.SaveAs("Output.xlsx");

            // Close Spreadsheet
            document.Close();

            // open generated XLS document in default program
            Process.Start("Output.xlsx");

        }
    }
}