private byte[] FileFIller<T>(List<T> elements)
        {
            byte[] res;


            using (var ms = new MemoryStream())
            {
                IWorkbook workbook = new XSSFWorkbook();

                ISheet sheet = workbook.CreateSheet(elements.First().GetType() + "s");

                var rowIndex = 0;


                foreach (var element in elements)
                {
                    IRow row = sheet.CreateRow(rowIndex);
                    var propIndex = 0;

                    foreach (var prop in element.GetType().GetProperties())
                    {
                        if (element.IsAttributeDefined(prop.Name, typeof(Exportable)))
                        {
                            var value = rowIndex == 0 ? prop.Name : prop.GetValue(element, null);

                            value = value ?? "";

                            row.CreateCell(propIndex).SetCellValue(value.ToString());

                            ++propIndex;

                        }


                    }
                    rowIndex++;
                }

                workbook.Write(ms);

                res = ms.ToArray();
            }

            return res;
        }