diff --git a/src/Umbraco.Core/Events/CancellableEventArgs.cs b/src/Umbraco.Core/Events/CancellableEventArgs.cs
index a245aeb367..7a10623427 100644
--- a/src/Umbraco.Core/Events/CancellableEventArgs.cs
+++ b/src/Umbraco.Core/Events/CancellableEventArgs.cs
@@ -2,7 +2,6 @@ using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Security.Permissions;
-using Umbraco.Core.Models.PublishedContent;
 
 namespace Umbraco.Core.Events
 {
@@ -13,13 +12,15 @@ namespace Umbraco.Core.Events
 	public class CancellableEventArgs : EventArgs, IEquatable<CancellableEventArgs>
     {
 		private bool _cancel;
+        private Dictionary<string, object> _eventState;
+
+        private static readonly ReadOnlyDictionary<string, object> EmptyAdditionalData = new ReadOnlyDictionary<string, object>(new Dictionary<string, object>());
 
         public CancellableEventArgs(bool canCancel, EventMessages messages, IDictionary<string, object> additionalData)
         {
             CanCancel = canCancel;
             Messages = messages;
             AdditionalData = new ReadOnlyDictionary<string, object>(additionalData);
-            EventState = new Dictionary<string, object>();
         }
 
         public CancellableEventArgs(bool canCancel, EventMessages eventMessages)
@@ -27,8 +28,7 @@ namespace Umbraco.Core.Events
             if (eventMessages == null) throw new ArgumentNullException("eventMessages");
             CanCancel = canCancel;
             Messages = eventMessages;
-            AdditionalData = new ReadOnlyDictionary<string, object>(new Dictionary<string, object>());
-            EventState = new Dictionary<string, object>();
+            AdditionalData = EmptyAdditionalData;
         }
 
         public CancellableEventArgs(bool canCancel)
@@ -36,19 +36,16 @@ namespace Umbraco.Core.Events
 			CanCancel = canCancel;
             //create a standalone messages
             Messages = new EventMessages();
-            AdditionalData = new ReadOnlyDictionary<string, object>(new Dictionary<string, object>());
-		    EventState = new Dictionary<string, object>();
+		    AdditionalData = EmptyAdditionalData;
         }
 
         public CancellableEventArgs(EventMessages eventMessages)
             : this(true, eventMessages)
-        {
-        }
+        { }
 
         public CancellableEventArgs()
 			: this(true)
-		{
-		}
+		{ }
 
 		/// <summary>
 		/// Flag to determine if this instance will support being cancellable
@@ -98,16 +95,19 @@ namespace Umbraco.Core.Events
         /// In some cases raised evens might need to contain additional arbitrary readonly data which can be read by event subscribers
         /// </summary>
         /// <remarks>
-        /// This allows for a bit of flexibility in our event raising - it's not pretty but we need to maintain backwards compatibility 
+        /// This allows for a bit of flexibility in our event raising - it's not pretty but we need to maintain backwards compatibility
         /// so we cannot change the strongly typed nature for some events.
         /// </remarks>
         public ReadOnlyDictionary<string, object> AdditionalData { get; private set; }
 
         /// <summary>
-        /// This can be used by event subscribers to store state in the event args so they easily deal with custom state data between a starting ("ing") 
+        /// This can be used by event subscribers to store state in the event args so they easily deal with custom state data between a starting ("ing")
         /// event and an ending ("ed") event
-        /// </summary>
-        public IDictionary<string, object> EventState { get; private set; }
+        /// </summary>
+        public IDictionary<string, object> EventState
+        {
+            get { return _eventState ?? (_eventState = new Dictionary<string, object>()); }
+        }
 
 	    public bool Equals(CancellableEventArgs other)
 	    {
@@ -120,13 +120,13 @@ namespace Umbraco.Core.Events
 	    {
 	        if (ReferenceEquals(null, obj)) return false;
 	        if (ReferenceEquals(this, obj)) return true;
-	        if (obj.GetType() != this.GetType()) return false;
+	        if (obj.GetType() != GetType()) return false;
 	        return Equals((CancellableEventArgs) obj);
 	    }
 
 	    public override int GetHashCode()
 	    {
-	        return (AdditionalData != null ? AdditionalData.GetHashCode() : 0);
+	        return AdditionalData != null ? AdditionalData.GetHashCode() : 0;
 	    }
 
 	    public static bool operator ==(CancellableEventArgs left, CancellableEventArgs right)
@@ -136,7 +136,7 @@ namespace Umbraco.Core.Events
 
 	    public static bool operator !=(CancellableEventArgs left, CancellableEventArgs right)
 	    {
-	        return !Equals(left, right);
+	        return Equals(left, right) == false;
 	    }
 	}
 }
\ No newline at end of file