public async Task <IActionResult> CreateOneClient(ClientViewModel viewModel)
        {
            if (ModelState.IsValid)
            {
                Client client = new Client {
                    Name           = viewModel.Name,
                    Surname        = viewModel.Surname,
                    PassportNum    = viewModel.PassportNum,
                    PassportSeries = viewModel.PassportSeries,
                    Adress         = viewModel.Adress,
                    Email          = viewModel.Email
                };
                await _context.AddClient(client);

                return(RedirectToAction("Clients", "Bank"));
            }
            else
            {
                return(View("CreateClient", viewModel));
            }
        }