public async Task <IActionResult> PutManager(int id, Manager manager)
        {
            if (id != manager.ManagerID)
            {
                return(BadRequest());
            }

            _context.Entry(manager).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ManagerExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }
        public async Task <IActionResult> PutEmployee(int id, Employee employee)
        {
            if (id != employee.EmployeeID)
            {
                return(BadRequest());
            }

            _context.Entry(employee).State = EntityState.Modified;

            try
            {
                // Validation check a manager with ManagerID exists in the managers table, and that the ID includes 9 digits
                if (_context.Managers.Any(e => e.ManagerID == employee.ManagerID) && IDValidation(employee.ID))
                {
                    await _context.SaveChangesAsync();
                }
                else
                {
                    throw new System.ArgumentException("Manager must be in the managers list, and ID must include 9 digits", "ManagerID");
                }
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!EmployeeExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }
            return(NoContent());
        }