diff --git a/src/ObservableCollections/IObservableCollection.cs b/src/ObservableCollections/IObservableCollection.cs
index 0568de1..629627e 100644
--- a/src/ObservableCollections/IObservableCollection.cs
+++ b/src/ObservableCollections/IObservableCollection.cs
@@ -50,4 +50,34 @@ namespace ObservableCollections
     public interface INotifyCollectionChangedSynchronizedView<out TView> : IReadOnlyCollection<TView>, INotifyCollectionChanged, INotifyPropertyChanged, IDisposable
     {
     }
+
+    public static class ObservableCollectionExtensions
+    {
+        public static ISynchronizedViewList<T> ToViewList<T>(this IObservableCollection<T> collection)
+        {
+            return ToViewList(collection, static x => x);
+        }
+
+        public static ISynchronizedViewList<TView> ToViewList<T, TView>(this IObservableCollection<T> collection, Func<T, TView> transform)
+        {
+            // Optimized for non filtered
+            return new NonFilteredSynchronizedViewList<T, TView>(collection.CreateView(transform));
+        }
+
+        public static INotifyCollectionChangedSynchronizedView<T> ToNotifyCollectionChanged<T>(this IObservableCollection<T> collection)
+        {
+            return ToNotifyCollectionChanged(collection, null);
+        }
+
+        public static INotifyCollectionChangedSynchronizedView<T> ToNotifyCollectionChanged<T>(this IObservableCollection<T> collection, ICollectionEventDispatcher? collectionEventDispatcher)
+        {
+            return ToNotifyCollectionChanged(collection, static x => x, collectionEventDispatcher);
+        }
+
+        public static INotifyCollectionChangedSynchronizedView<TView> ToNotifyCollectionChanged<T, TView>(this IObservableCollection<T> collection, Func<T, TView> transform, ICollectionEventDispatcher? collectionEventDispatcher)
+        {
+            // Optimized for non filtered
+            return new NonFilteredNotifyCollectionChangedSynchronizedView<T, TView>(collection.CreateView(transform), collectionEventDispatcher);
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/ObservableCollections/ObservableList.Views.cs b/src/ObservableCollections/ObservableList.Views.cs
index d366b54..c965ee3 100644
--- a/src/ObservableCollections/ObservableList.Views.cs
+++ b/src/ObservableCollections/ObservableList.Views.cs
@@ -14,34 +14,6 @@ namespace ObservableCollections
             return new View<TView>(this, transform);
         }
 
-        public ISynchronizedViewList<T> ToViewList()
-        {
-            // NOTE: for more optimize, no need to create View.
-            return ToViewList(static x => x);
-        }
-
-        public ISynchronizedViewList<TView> ToViewList<TView>(Func<T, TView> transform)
-        {
-            // Optimized for non filtered
-            return new NonFilteredSynchronizedViewList<T, TView>(CreateView(transform));
-        }
-
-        public INotifyCollectionChangedSynchronizedView<T> ToNotifyCollectionChanged()
-        {
-            return ToNotifyCollectionChanged(null);
-        }
-
-        public INotifyCollectionChangedSynchronizedView<T> ToNotifyCollectionChanged(ICollectionEventDispatcher? collectionEventDispatcher)
-        {
-            return ToNotifyCollectionChanged(static x => x, collectionEventDispatcher);
-        }
-
-        public INotifyCollectionChangedSynchronizedView<TView> ToNotifyCollectionChanged<TView>(Func<T, TView> transform, ICollectionEventDispatcher? collectionEventDispatcher)
-        {
-            // Optimized for non filtered
-            return new NonFilteredNotifyCollectionChangedSynchronizedView<T, TView>(CreateView(transform), collectionEventDispatcher);
-        }
-
         internal sealed class View<TView> : ISynchronizedView<T, TView>
         {
             public ISynchronizedViewFilter<T> Filter