Minor clean-up on Entity, Domain Events.

src/Services/Ordering/Ordering.Domain/AggregatesModel/OrderAggregate/Order.cs

@@ -178,16 +178,16 @@ namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.O
         private void AddOrderStartedDomainEvent(string userId, int cardTypeId, string cardNumber,
                 string cardSecurityNumber, string cardHolderName, DateTime cardExpiration)
         {
-            var orderStartedDomainEvent = new OrderStartedDomainEvent(
+            var orderStartedDomainEvent = new OrderStartedDomainEvent(this, userId, cardTypeId, 
-                this, userId, cardTypeId, cardNumber, cardSecurityNumber,
+                                                                      cardNumber, cardSecurityNumber,
-                cardHolderName, cardExpiration);
+                                                                      cardHolderName, cardExpiration);
 
             this.AddDomainEvent(orderStartedDomainEvent);
         }
 
         private void StatusChangeException(OrderStatus orderStatusToChange)
         {
-            throw new OrderingDomainException($"Not possible to change order status from {OrderStatus.Name} to {orderStatusToChange.Name}.");
+            throw new OrderingDomainException($"Is not possible to change the order status from {OrderStatus.Name} to {orderStatusToChange.Name}.");
         }
 
         public decimal GetTotal()

src/Services/Ordering/Ordering.Domain/Events/OrderStartedDomainEvent.cs

@@ -9,8 +9,7 @@ namespace Ordering.Domain.Events
     /// <summary>
     /// Event used when an order is created
     /// </summary>
-    public class OrderStartedDomainEvent
+    public class OrderStartedDomainEvent : INotification
-        : INotification
     {
         public string UserId { get; private set; }
         public int CardTypeId { get; private set; }
@@ -21,9 +20,9 @@ namespace Ordering.Domain.Events
         public Order Order { get; private set; }
 
         public OrderStartedDomainEvent(Order order, string userId,
-            int cardTypeId, string cardNumber, 
+                                       int cardTypeId, string cardNumber, 
-            string cardSecurityNumber, string cardHolderName, 
+                                       string cardSecurityNumber, string cardHolderName, 
-            DateTime cardExpiration)
+                                       DateTime cardExpiration)
         {
             Order = order;
             UserId = userId;

src/Services/Ordering/Ordering.Domain/SeedWork/Entity.cs

@@ -22,6 +22,7 @@
 
         private List<INotification> _domainEvents;
         public List<INotification> DomainEvents => _domainEvents;       
+        
         public void AddDomainEvent(INotification eventItem)
         {
             _domainEvents = _domainEvents ?? new List<INotification>();

src/Services/Ordering/Ordering.Infrastructure/OrderingContext.cs

@@ -12,7 +12,7 @@ using System.Threading.Tasks;
 
 namespace Microsoft.eShopOnContainers.Services.Ordering.Infrastructure
 {
-    public class OrderingContext : DbContext,IUnitOfWork
+    public class OrderingContext : DbContext, IUnitOfWork
     {
         public const string DEFAULT_SCHEMA = "ordering";
         public DbSet<Order> Orders { get; set; }