public IActionResult Delete(int departmentId)
        {
            DepartmentsViewModel model = new DepartmentsViewModel();

            if (model.CountEmployeesOfThisDepartment(_unitOfWork.Departments.GetById(departmentId), _unitOfWork) == 0)
            {
                DeleteDepartment(_unitOfWork.Departments.GetById(departmentId));
                return(RedirectToAction(nameof(List)));
            }
            else
            {
                return(RedirectToAction(nameof(ConfirmDelete), new { departmentId = departmentId }));
            }
        }