using System.Diagnostics;
using System.Drawing;
using Bytescout.Spreadsheet;

namespace AddBackgroundImage
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create new spreadsheet (or open existing)
            Spreadsheet doc = new Spreadsheet();
            doc.RegistrationName = "demo";
            doc.RegistrationKey = "demo";

            // Add worksheet
            Worksheet worksheet = doc.Worksheets.Add();

            // Put background image on the worksheet
            worksheet.BackgroundPicture = Image.FromFile("image1.jpg");

            // Save document
            doc.SaveAs("output.xls");

            // Close spreadsheet
            doc.Close();

            // Open generated XLS document in default application
            Process.Start("output.xls");

            doc.Dispose();
        }
    }
}