diff --git a/Orm/Xtensive.Orm/Collections/ChangeNotifierEventArgs.cs b/Orm/Xtensive.Orm/Collections/ChangeNotifierEventArgs.cs
deleted file mode 100644
index 43a2f109d..000000000
--- a/Orm/Xtensive.Orm/Collections/ChangeNotifierEventArgs.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright (C) 2007-2022 Xtensive LLC.
-// This code is distributed under MIT license terms.
-// See the License.txt file in the project root for more information.
-// Created by: Dmitri Maximov
-// Created:    2007.10.15
-
-using System;
-
-
-namespace Xtensive.Collections
-{
-  /// <summary>
-  /// Represents a set of information describing <see cref="IChangeNotifier"/> change.
-  /// </summary>
-  [Serializable]
-  public readonly struct ChangeNotifierEventArgs
-  {
-    /// <summary>
-    /// Gets the object representing some additional change information.
-    /// </summary>
-    /// <value>The info.</value>
-    public object ChangeInfo { get; }
-
-    /// <summary>
-    /// Initializes a new instance of this type.
-    /// </summary>
-    /// <param name="changeInfo">The info.</param>
-    public ChangeNotifierEventArgs(object changeInfo)
-    {
-      ChangeInfo = changeInfo;
-    }
-  }
-}
diff --git a/Orm/Xtensive.Orm/Collections/Interfaces/IChangeNotifier.cs b/Orm/Xtensive.Orm/Collections/Interfaces/IChangeNotifier.cs
deleted file mode 100644
index 01bd96f68..000000000
--- a/Orm/Xtensive.Orm/Collections/Interfaces/IChangeNotifier.cs
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright (C) 2003-2010 Xtensive LLC.
-// All rights reserved.
-// For conditions of distribution and use, see license.
-// Created by: Dmitri Maximov
-// Created:    2007.10.15
-
-using System;
-using Xtensive.Collections;
-
-namespace Xtensive.Collections
-{
-  /// <summary>
-  /// An object exposing change related events contract.
-  /// </summary>
-  public interface IChangeNotifier
-  {
-    /// <summary>
-    /// Occurs when this instance is about to be changed.
-    /// </summary>
-    event EventHandler<ChangeNotifierEventArgs> Changing;
-
-    /// <summary>
-    /// Occurs when this instance is changed.
-    /// </summary>
-    event EventHandler<ChangeNotifierEventArgs> Changed;
-  }
-}
\ No newline at end of file
diff --git a/Orm/Xtensive.Orm/Orm/Model/NodeCollection.cs b/Orm/Xtensive.Orm/Orm/Model/NodeCollection.cs
index cfcfa73c1..bac4a9452 100644
--- a/Orm/Xtensive.Orm/Orm/Model/NodeCollection.cs
+++ b/Orm/Xtensive.Orm/Orm/Model/NodeCollection.cs
@@ -18,12 +18,6 @@ namespace Xtensive.Orm.Model
   public class NodeCollection<TNode> : CollectionBaseSlim<TNode>
     where TNode: Node
   {
-    [NonSerialized, DebuggerBrowsable(DebuggerBrowsableState.Never)]
-    private EventHandler<ChangeNotifierEventArgs> itemChangedHandler;
-
-    [NonSerialized, DebuggerBrowsable(DebuggerBrowsableState.Never)]
-    private EventHandler<ChangeNotifierEventArgs> itemChangingHandler;
-
     protected IDictionary<string, TNode> NameIndex;
     
     /// <summary>
@@ -63,7 +57,6 @@ public override void Add(TNode item)
       try {
         base.Add(item);
         NameIndex.Add(item.Name, item);
-        TrySubscribe(item);
       }
       catch (ArgumentException e){
         throw new InvalidOperationException(
@@ -88,7 +81,6 @@ public override void AddRange(IEnumerable<TNode> nodes)
     public override bool Remove(TNode item)
     {
       if (base.Remove(item)) {
-        TryUnsubscribe(item);
         NameIndex.Remove(item.Name);
         return true;
       }
@@ -99,9 +91,6 @@ public override bool Remove(TNode item)
     public override void Clear()
     {
       EnsureNotLocked();
-      foreach(var item in this) {
-        TryUnsubscribe(item);
-      }
       base.Clear();
       NameIndex.Clear();
     }
@@ -163,43 +152,6 @@ protected virtual string GetExceptionMessage(string key)
       return string.Format(Strings.ExItemWithKeyXWasNotFound, key);
     }
 
-    /// <summary>
-    /// Tries to subscribe the collection on 
-    /// change notifications from the specified item.
-    /// </summary>
-    /// <param name="item">The item to try.</param>
-    protected void TrySubscribe(TNode item)
-    {
-      if (item is IChangeNotifier notifier) {
-        notifier.Changing += itemChangingHandler;
-        notifier.Changed += itemChangedHandler;
-      }
-    }
-
-    /// <summary>
-    /// Tries to unsubscribe the collection from
-    /// change notifications from the specified item.
-    /// </summary>
-    /// <param name="item">The item to try.</param>
-    protected void TryUnsubscribe(TNode item)
-    {
-      if (item is IChangeNotifier notifier) {
-        notifier.Changing -= itemChangingHandler;
-        notifier.Changed -= itemChangedHandler;
-      }
-    }
-
-    protected virtual void OnItemChanging(object sender, ChangeNotifierEventArgs e)
-    {
-      NameIndex.Remove(((TNode) sender).Name);
-    }
-
-    protected virtual void OnItemChanged(object sender, ChangeNotifierEventArgs e)
-    {
-      var tNode = (TNode)sender;
-      NameIndex.Add(tNode.Name, tNode);
-    }
-
     /// <inheritdoc/>
     public override void Lock(bool recursive)
     {
@@ -230,8 +182,6 @@ protected NodeCollection(Node owner, string name, Dictionary<string, TNode> name
       NameIndex = nameIndex;
       Owner = owner;
       Name = name;
-      itemChangingHandler = OnItemChanging;
-      itemChangedHandler = OnItemChanged;
     }
 
     // Type initializer