public async Task <IActionResult> PutLineItem(int id, LineItem lineItem)
        {
            // NLog
            string message = $"(API Server) -Try to PUT (update) LineItem " + id + "(Id) - Controller : LineItemsController; " +
                             "Actionname: PutLineItem(...); HTTP method : HttpPut; Time: " + DateTime.Now + "\n";

            _logger.Info(message);

            try
            {
                _context.Entry(lineItem).State = EntityState.Modified;
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                // NLog Framework Call

                // LOG INFO
                _logger.Info("INFORMATION DETAILS, Exception occured during operation : " + message);
                _logger.Info("EXCEPTION DETAILS: " + ex.Message + "\n");

                // LOG WARN
                _logger.Warn("WARNING DETAILS, Exception occured during operation : " + message);
                _logger.Warn("EXCEPTION DETAILS: " + ex.Message + "\n");


                // LOG ERROR
                _logger.Error("ERROR DETAILS, Exception occured during operation : " + message);
                _logger.Error("EXCEPTION DETAILS: " + ex.Message + "\n");


                // LOG TRACE
                _logger.Trace("WARNING DETAILS, Exception occured during operation : " + message);
                _logger.Trace("EXCEPTION DETAILS: " + ex.Message + "\n");


                // LOG FATAL
                _logger.Fatal("FATAL DETAILS, Exception occured during operation : " + message);
                _logger.Fatal("EXCEPTION DETAILS: " + ex.Message + "\n");


                // LOG DEGUG
                _logger.Debug("DEGUG DETAILS, Exception occured during operation : " + message);
                _logger.Debug("EXCEPTION DETAILS: " + ex.Message + "\n");

                if (id != lineItem.Id)
                {
                    return(BadRequest());
                }
                else if (!LineItemExists(id))
                {
                    return(NotFound());
                }

                return(NotFound());
            }

            return(NoContent());
        }
        public async Task <ActionResult <ShoppingCart> > PostShoppingCart(ShoppingCart shoppingCart)
        {
            // NLog
            string message = $"(API Server) -Try to POST ShoppingCart " + shoppingCart.Id + " (Id) - Controller : ShoppingCartsController; " +
                             "Actionname: PostShoppingCart(...); HTTP method : HttpPost; Time: " + DateTime.Now + "\n";

            _logger.Info(message);

            try
            {
                _context.ShoppingCarts.Add(shoppingCart);
                await _context.SaveChangesAsync();

                _context.Entry(shoppingCart).GetDatabaseValues();

                return(CreatedAtAction("GetShoppingCarts", new { id = shoppingCart.Id }, shoppingCart));
            }
            catch (Exception ex)
            {
                // NLog Framework Call

                // LOG INFO
                _logger.Info("INFORMATION DETAILS, Exception occured during operation : " + message);
                _logger.Info("EXCEPTION DETAILS: " + ex.Message + "\n");

                // LOG WARN
                _logger.Warn("WARNING DETAILS, Exception occured during operation : " + message);
                _logger.Warn("EXCEPTION DETAILS: " + ex.Message + "\n");

                // LOG ERROR
                _logger.Error("ERROR DETAILS, Exception occured during operation : " + message);
                _logger.Error("EXCEPTION DETAILS: " + ex.Message + "\n");

                // LOG TRACE
                _logger.Trace("WARNING DETAILS, Exception occured during operation : " + message);
                _logger.Trace("EXCEPTION DETAILS: " + ex.Message + "\n");

                // LOG FATAL
                _logger.Fatal("FATAL DETAILS, Exception occured during operation : " + message);
                _logger.Fatal("EXCEPTION DETAILS: " + ex.Message + "\n");

                // LOG DEGUG
                _logger.Debug("DEGUG DETAILS, Exception occured during operation : " + message);
                _logger.Debug("EXCEPTION DETAILS: " + ex.Message + "\n");

                return(StatusCode(StatusCodes.Status500InternalServerError, ex.Message));
            }
        }