Handling of Stockprices not delivered

StockDAL/StockRepository.cs

@@ -59,6 +59,7 @@ namespace StockDAL
 
         public void UpdateActualPrice(int id, decimal price)
         {
+            if (price < 0) return;
             using var context = new StockContext();
             var entity = (from stk in context.Stocks
                           where stk.Id == id