using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using OfficeOpenXml;
using System.Text.RegularExpressions;

namespace ExcelFillerTest
{
    class Program
    {
        static void Main(string[] args)
        {

            using (ExcelPackage p = new ExcelPackage(new FileInfo("treso.xlsx"), true))
            {
                p.Workbook.Worksheets[1].InsertRow(12, 5);
            }
        }
}
}

DOWNLOAD EXCEL WORKBOOK HERE