Quick demo of creating a spreadsheet

gistfile1.txt

using System.IO;
using System.Linq;
using OfficeOpenXml; // comes from EPPlus

namespace SpreadsheetGenerationSample
{
    class Program
    {
        static void Main(string[] args)
        {
            var template = new ExcelPackage(new FileInfo(@"c:\Users\james\Documents\sample.xlsx"));
            
            var package = new ExcelPackage();
            package.Workbook.Worksheets.Add("mySample1", template.Workbook.Worksheets.First());
            package.Workbook.Worksheets.Add("mySample2", template.Workbook.Worksheets.First());
            var info = new FileInfo(@"c:\Users\james\Documents\test.xlsx");
            package.SaveAs(info);
        }
    }
}