public static void AddCompany(AddCompanyForm rent)
        {
            using (var _context = new DiemServiceDB())
            {
                User found = _context.UserDbSet.Where(user => user.Username == rent.OwnerUsername).FirstOrDefault();
                switch (found.Role)
                {
                case Role.AdminAvio:
                    AvioCompany toAdd   = rent.getAvio();
                    string      imgName = "avioCompany" + toAdd.Id;
                    File.WriteAllBytes(AppDomain.CurrentDomain.BaseDirectory + "/" + imgName, Convert.FromBase64String(toAdd.Logo));
                    toAdd.Logo  = imgName;
                    toAdd.Owner = found;
                    _context.AdminAvioDbSet.Include(x => x.OwnedAvioCompanies)
                    .Where(x => x.Id == found.UlogaID)
                    .FirstOrDefault().OwnedAvioCompanies
                    .Add(_context.AvioCompanyDbSet.Add(toAdd));
                    break;

                case Role.AdminRentACar:
                    RentACar toAdd2 = rent.getRent();
                    toAdd2.Owner = found;
                    _context.AdminRentDbSet.Include(x => x.OwnedRentServices)
                    .Where(x => x.Id == found.UlogaID)
                    .FirstOrDefault().OwnedRentServices
                    .Add(_context.RentACarDbSet.Add(toAdd2));
                    break;

                default:
                    break;
                }

                _context.SaveChanges();
            }
        }