public void t()
        {
            var reader = new ExcelFileReader();
            var itmes  = reader.ReadDistinctBrands(
                @"D:\dev\C#\ExposurePresenter\XLSInputFiles\PLK Grzegorz branże.xlsx").ToArray();
//            var db = new ExposureDb();
//            foreach (var item in itmes)
//            {
//                db.ExposureRecords.Add(item);
//            }
        }
        public void PopulateData(string filePath, ExposureDb db)
        {
            var fileReader = new ExcelFileReader();

            db.Branches.AddOrUpdate(branch => branch.Name, fileReader.ReadDistinctBrnaches(filePath).ToArray());
            db.Brands.AddOrUpdate(brand => brand.Name, fileReader.ReadDistinctBrands(filePath).ToArray());
            db.Disciplines.AddOrUpdate(discipline => discipline.Name,
                                       fileReader.ReadDistinctDisciplines(filePath).ToArray());

            var records = fileReader.ReadExposureRecords(filePath).ToArray();

            foreach (var exposureRecord in records)
            {
                db.ExposureRecords.AddOrUpdate(record => new { record.Brand, record.Month }, exposureRecord);
                db.SaveChanges();
            }
        }