Added multivar create notification

Sharp7.Rx/Basics/DisposableItem.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Linq;
+
+namespace Sharp7.Rx.Basics
+{
+    internal class DisposableItem<TValue> : IDisposable
+    {
+        private readonly Action disposeAction;
+
+        bool disposed;
+
+        public DisposableItem(IObservable<TValue> observable, Action disposeAction)
+        {
+            this.disposeAction = disposeAction;
+            Observable = observable;
+        }
+
+        public IObservable<TValue> Observable { get; }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposed) return;
+
+            if (disposing)
+            {
+                disposeAction();
+            }
+
+            disposed = true;
+        }
+    }
+}